Hokkien Huay Kuan Combined Primary 2010 PSLE Math Prelim Paper 2 Q6

Randy brought along a certain amount of money to buy files. If he bought the files at $1.50 each, he would have $17.50 left. If he bought the same number of files at $2.70 each, he would have $9.10 left. How much money did he bring along?

Solution

1 unit x $1.50 + $17.50 ----- 1 unit x $2.70 + $9.10
($2.70 x 1 unit) - ($1.50 x 1 unit) ----- $17.50 - $9.10
($1.20 x 1 unit) ----- $8.40
1 unit ----- $8.40 divided by $1.20 = 7

He brought along -----
(7 x $2.70) + $9.10
= $18.90 + $9.10
= $28

Answer: $28

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