Question

15 post cards cost RS 7.50.what will be the cost of 31 post cards?
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Answer 1

Answer:

₹15.5 is the answer

Step-by-step explanation:

15 post cards cost ₹7.50

1 post card costs ₹7.50/15= ₹0.5

31 ,post cards cost ₹0.5×31=₹15.5

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Answer 2

Step-by-step explanation:

$15 \: post \: cards \: = rs \: 7.50 \\ cost \: of \: 1card \: = rs(7.50 \div 15) \\ =rs \: 0.5 \\ cost \: of \: 31postcard =rs \: ( 0.5 \times 31) \\ = rs \: 15.5$

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