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Sunday, February 19 2017 @ 03:08 PM CST
 Forum Index >  Test Paper Related >  Primary 3 Matters
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By: tangara (offline)  Thursday, October 13 2011 @ 12:10 AM CDT (Read 1164 times)  
tangara

Hi,

I'm stuck with yet another this type of question.

John had twice as many stickers as David.
After John gave away 68 of his stickers & David gave away 23 of his stickers, each of them had the same no. of stickers left.
How many stickers did John have at first?

The answer is : 90.

Serious, I'm hopeless about this kind of question.

Appreciate someone can teach me how to do it.

Thanks again.

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Registered: 07/31/10
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By: GIM (offline)  Thursday, October 13 2011 @ 01:51 AM CDT  
GIM

At first :
John ------ 2 units
David ----- 1 unit

After
John ------ 2 units - 68
David ----- 1 unit - 23
[2 units - 68] = [1 unit - 23]

1 unit ------- 68 - 23 = 45
John ------- 2units x 45 = 90 (answer)

Draw the model and you will be able to see clearly.

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Registered: 11/07/10
Posts: 70

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