Question

20 books price 800 RSS then what is the cost of 15 books
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Answer 1

Answer:

total cost of 20 books= 800

cost on 1 book= 800/20 = 40 rupees

so cost of 15 books = 15 × 40 = 600 rupees

Step-by-step explanation:

hope it'll help you.

Answer 2

Answer:

$20books \: cost \: 800rps \\ one \: book \: cost = 800 \div 20 \\ = 40rps \\ cost \: of \: 15books = 40 \times 15 \\ = 600rps$