maths p5: need help

ïïï¥

8 Oct 08, 10:18

i have the following questions that stumped me in my last test. (48/100 marks) :-(

1.ratio of alan's age to peter's age is 5:4 now. in 6 yrs time, their total age is 120yrs. how old is alan now?

2. a sum of money was shared bet tom and jerry in the ratio 3:4. when tom gave 1/6 of his momey to jerry and jerry gave 1/3 of his new amount to tom, jom had $650 more than jerry. what was the sum of money shared by tom and jerry?

3.the participants at a conference are australia, singapore and taiwan. there are 240 more singaporean than australians. 34% of the participants are australians. the remaining are taiwanese.

a. how many australians are there at the conference?

b. % of singaporeans at the conference.

thanks!

FirePig

8 Oct 08, 10:28

Originally posted by ï�ï�ï�¥:

i have the following questions that stumped me in my last test. (48/100 marks) :-(

1.ratio of alan's age to peter's age is 5:4 now. in 6 yrs time, their total age is 120yrs. how old is alan now?

2. a sum of money was shared bet tom and jerry in the ratio 3:4. when tom gave 1/6 of his momey to jerry and jerry gave 1/3 of his new amount to tom, jom had $650 more than jerry. what was the sum of money shared by tom and jerry?

3.the participants at a conference are australia, singapore and taiwan. there are 240 more singaporean than australians. 34% of the participants are australians. the remaining are taiwanese.

a. how many australians are there at the conference?

b. % of singaporeans at the conference.

thanks!

Q1) 120 -12 = 108

9 units = 108

Q2) 3 : 4 = 6: 8

after giving 1/6, ratio becomes 5:9

After giving 1/3, ratio becomes8:6

2 units = 650

14 units = 4550

q3) are there taiwanese?

baiyun

8 Oct 08, 17:33

Hi,

baiyun

8 Oct 08, 17:40

Hi

You may wish to review your Q3 again.Is the total number of participants given?

hiphop2009

8 Oct 08, 18:02

Originally posted by baiyun:

Hi,

wow i am impressed! =)

ïïï¥

8 Oct 08, 18:57

thanks, all.

for Q3, yes, i left out that 144 are taiwanese.

thanks again!

baiyun

9 Oct 08, 07:39

Originally posted by ï�ï�ï�¥:

thanks, all.

for Q3, yes, i left out that 144 are taiwanese.

thanks again!

Hi, Hope this helps.

ïïï¥

9 Oct 08, 21:14

thanks for all the help. this is really useful in helping me understand the methods.

can i trouble all of you for a few more as a prep for my exams? these are questions given by my maths teacher for revision.

a. james is 1/4 as old as pete. in 5 yrs time, james will be 1/3 as old as pete. how old is james now?

b. 6 jugs of water can fill 5/8 of a pail. another 3 jugs and 6 cups of water are needed to fill the pail completely. how many cups of water can the pail hold?

c. anne and betty had $2600 altogether. after anne spent 3/4 of her money and betty spent 3/5 of hers, they each had the same amount of money left. how much money did each girl have at first?

thanks in advance!

^tamago^

9 Oct 08, 21:21

i didn't have internet when i was in p5

FirePig

10 Oct 08, 01:19

wa seh...how you get your nick, threadstarter?

wonderamazement

10 Oct 08, 01:21

Originally posted by ^tamago^:

i didn’t have internet when i was in p5

hiphop2009

10 Oct 08, 01:32

wow so now i know students as young as 11 years old surf my forum!

baiyun

10 Oct 08, 14:18

Hi, Hope this helps

ïïï¥

10 Oct 08, 18:42

Originally posted by baiyun:

Hi, Hope this helps

thanks!

ïïï¥

10 Oct 08, 18:50

Originally posted by ^tamago^:

i didn’t have internet when i was in p5

our school has e-learning days since last year. each of us is given an account where we need to log-on at home to finish the homework given by our teachers.

Lee012lee

10 Oct 08, 18:50

2008 PSLE Questions

Q48 Bryan invited 20 more boys than girls to a party. 3/4 of the boys and 2/3 of the girls came. 19 people didn't come. How many people did he invite?

Q47 Visitors, 40% are children, 3/4 of the adults are women. (a) what is the ratio of children:men:women. (b) the second day, children number increased by 20%, adults number remain the same but women is 3/5 of adult. if there are 336 more children than women, how many visitors on second day

Q46 A millipede is climbing up a wall.
For every 3cm it climbs, it slips by 1cm.
It takes 3 seconds to climb 1 cm and 1 second to slip by 1cm.

(a) How far would the millipede have climbed after 1 minute?
(b) How long would the millipede take to climb 56cm?

Anyone has questions for Q43, Q44, Q45 ?

dibilo

10 Oct 08, 22:55

wah baiyun, what program did you use to make those charts? damn nice leh haha

FirePig

10 Oct 08, 22:59

Originally posted by Lee012lee:

2008 PSLE Questions

Q48   Bryan invited 20 more boys than girls to a party. 3/4 of the boys and 2/3 of the girls came. 19 people didn't come. How many people did he invite?

Q47   Visitors, 40% are children, 3/4 of the adults are women. (a) what is the ratio of children:men:women. (b) the second day, children number increased by 20%, adults number remain the same but women is 3/5 of adult. if there are 336 more children than women, how many visitors on second day

Q46   A millipede is climbing up a wall.
For every 3cm it climbs, it slips by 1cm.
It takes 3 seconds to climb 1 cm and 1 second to slip by 1cm.

(a) How far would the millipede have climbed after 1 minute?
(b) How long would the millipede take to climb 56cm?

Anyone has questions for Q43, Q44, Q45 ?

Q48) Let 4 units to represent all the boys he invited and blah blah
4 units = 3 parts + 20
1 unit + 1 parts = 19

Therefore, 4 units = 3(19-1 unit) + 20
4 units = 57 - 3 units + 20
7 units = 77
1 unit = 11
4 units = 44

3 parts = 44 - 20 = 24

He invited 44 + 24 = 68.

Q47)a)children:men:women = 40:45:15 = 8:9:3

b) 40 x 120/100 = 48% children

adults = remains at 60%

3/5 x 60% = 36% women

48 - 36 = 12%

12% = 336

1% = 28

Total percent in the end = 48 + 60 = 108%

108% = 3024

Correct me if i am wrong. lol quite hard.

Q 46) a) All together, one set = 4s

60 / 4 = 15 sets
15 x 2 = 30cm

b) 56 / 2 = 28 sets

28 x 4 = 112 cm.

dibilo

10 Oct 08, 23:08

Originally posted by Lee012lee:

2008 PSLE Questions

Q48   Bryan invited 20 more boys than girls to a party. 3/4 of the boys and 2/3 of the girls came. 19 people didn't come. How many people did he invite?

Q47   Visitors, 40% are children, 3/4 of the adults are women. (a) what is the ratio of children:men:women. (b) the second day, children number increased by 20%, adults number remain the same but women is 3/5 of adult. if there are 336 more children than women, how many visitors on second day

Q46   A millipede is climbing up a wall.
For every 3cm it climbs, it slips by 1cm.
It takes 3 seconds to climb 1 cm and 1 second to slip by 1cm.

(a) How far would the millipede have climbed after 1 minute?
(b) How long would the millipede take to climb 56cm?

Anyone has questions for Q43, Q44, Q45 ?

Q48)

taking care of the extras ->1/4 x 20 = 5

G and B are now of equal units. therefore all those not there are -> 5+1/4g + 1/3g = 19

7/12g = 14

g= 24, b = 24+20 = 44

24+44 = 68

@Firepig: lol note your ratio, your men and women reversed liao, else i agree with your answer for 47

46a) for every 3 cm climbed (3 x 3sec) it slips 1 cm (1sec)

total time spent climbing a total of 2 cm is 10sec (includes climbing and slipping)

1minute -> 60 sec thus 6 sets of 2 cm climbed. distance traveled will be 6 x 2cm = 12cm.

b)To climb 56 cm, 56/12= 4minute 40sec

FirePig

10 Oct 08, 23:43

Wa seh i get wrong for 2 questions...really cmi.

baiyun

11 Oct 08, 06:37

Originally posted by dibilo:

wah baiyun, what program did you use to make those charts? damn nice leh haha

Hi

Microsoft Word 2007

baiyun

11 Oct 08, 06:43

Hi

For the millipede's problem, part (b)

(54 + 2) , giving the time as 270 + 6 = 276s.The last 2cm was climbed without any slipping.

Yuki~!

11 Oct 08, 06:50

TS, your nick veli cool leh, how you do one

baiyun

11 Oct 08, 12:25

Hi,Hope this helps

baiyun

22 Oct 08, 08:35

Hi, Hope this helps