Question

cost of book is rupees 90 per dozen what is the cost of 18 books​

Answer 1

Answer:

Rs 135

Step-by-step explanation:

12 books costs 90

18 books will cost 90 × 18 / 12 = 1620 / 12 = rs 135

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Answer 2

Answer:

Cost of 12 books = 90 Rs.

Cost of 1 book = 90/12 rs. = 7.5 Rs

Cost of 18 books =

$\frac{90}{12} \times 18 = 135 \: rs.$

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