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Question 20

Daniel  [u][u][u][u][u]<—3u—>        <———  2/5 is equal to 1/4 of Felix

Felix     [u][u][u][u][u][u][u][u]

Since both ate 10 sweets, their difference 3u is a constant.

So 3u = 24 => u=8

Felix has 8u=64 sweets at first,

So after eating 10 sweets, Felix has 64-10= 54 sweets left

 

Question 21

Marc    [u][u]   <—————————- 2/5 as many as John and 1/2  as many as Paul

John    [u][u][u][u][u]

Paul     [u][u][u][u]

Total = 11u = 132 => u =12

Hence Marc has 2u=24 stamps

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