Question

if the cost of the cost af 20 books is ₹ 180 how much will 15 books cost?​

Answer 1

Answer:

15 books will cost Rs. 135.

Step-by-step explanation:

Given that the cost of 20 books is Rs. 180

Therefore, using unitary method,

The cost of 1 book will be = Rs. 180/20

                                           = Rs. 9

Therefore, the cost of 15 books will be = Rs. 9 * 15

                                                                 = Rs.135

Hence, we can say that 15 books will cost Rs. 135.

Answer 2

Answer:

Step-by-step explanation:

for 20 books it costs rupees 180

so, for 1 book it costs

180/20

=rupees 9

so therefore, one book costs rupees 9

so 15 books cost = 15*9= rupees 135