P5 Maths qn...

• Dixon999

  29 Oct 08, 21:24

  Ken and Patrick had $625 at first. After buying some books, the amount of money Ken has left is 4 times the amount of money he spent and the amount of money Patrick has left is 5 times the amount of money he spent. Find the amount of money Patrick had at first if they have a total of $510 left.

   

  Using the guess n check method is really too time consuming, i wonder if there's other methods (suitable for primary sch kids' understanding) 2 solve this qn...

• skythewood

  29 Oct 08, 21:29

  before spent ken X X X X X pat Y Y Y Y Y Y Y total 625 after spent ken X X X X pat Y Y Y Y Y total 510 X Y = 115 5 sets of XY = 575 left Y = 50.
• Dixon999

  29 Oct 08, 21:38

  The answer given is $300

• skythewood

  29 Oct 08, 21:40

  Originally posted by Dixon999:

  The answer given is $300

  6 set of Y is $300 right...... just treat the X and Y like boxes for P5 kids........

• tinuviel07

  29 Oct 08, 21:41

  you are assuming a relationship between x and y is it?

• skythewood

  29 Oct 08, 21:44

  Originally posted by tinuviel07:

  you are assuming a relationship between x and y is it?

  nah... just treat the X and Y like boxes for P5 kids........

  or units.