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Question

Answer

If 5 stamps used, 

S : E

12.5% : 87.5%

1:7

If 11 envelopes used,

S : E

20% : 100%

1:5

 

S : E

1u : 7u

+5   -11

1p : 5p

5u + 25 = 7u – 11

7u – 5u = 25 + 11

2u = 36

1u = 36 / 2 = 18

Total envelopes

= 7u

= 7 x 18

= 126

Total stamps

= 1u + 5

= 18 + 5

= 23

More

= 126 – 23

= 103

 

 

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