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 Forum Index >  Test Paper Related >  Primary 5 Matters
 Nanyang SA1 2011 Q29
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By: keenlearner (offline)  Friday, November 09 2012 @ 06:39 AM CST (Read 597 times)  
keenlearner

Just like to check if the answer key is wrong?

Question:
Hui Hui had some stickers. She gave 18 stickers to her sister and 5/7 of the stickers to Mary. Then, she used 3/4 of the remainder for her project and had 35 left. How many stickers did she have at first?

My answer is 508 but the answer key is 553.

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By: EMY (offline)  Friday, November 09 2012 @ 07:10 AM CST  
EMY

Consider originally, Hui Hui has 1 unit.
After giving away 5/7u, she has 2/7u.
She also gave away 18, so:
2/7u - 18 = a
If 3/4 a is given away, then remainder is 1/4 a = 35
So a = 35 x 4 = 140

2/7u - 18 = 140
2/7u = 158
u = 553

Eek!

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