Derrick had 2/3 as many stickers as Benedict. After Derrick bought another 8 stickers and Benedict lost 5 stickers, Derrick now has 4/5 as many stickers as Benedict. Find the number of stickers Derrick and Benedict had at first.

Solution

(Derrick after)

4 parts ----- 2 units + 8

2 parts ----- 1 unit + 4

2 parts ----- 1 part + 13 + 4

2 parts – 1 part ----- 17

1 part ----- 17

1 unit – 13 ----- 17

1 unit ----- 17 + 13 = 30

5 units ----- 30 x 5 = 150

Answer: 150 stickers

This blog is managed by Song Hock Chye, author of Improve Your Thinking Skills in Maths (P1-P3 series), which is published and distributed by EPH.

## Sunday, September 06, 2009

### Anglo Chinese School 2007 PSLE Math Prelim Q43

Labels:
Mathematics,
Whole Numbers

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