Question

the cost of 5 mental ability book is 19 what will be the cost of 8 such book​

Answer 1

Step-by-step explanation:

If cost of 5 books is 19, then cost of 1 book will be 19/5

Now,

cost of 8 books= 8×19/5

= 30.4

Answer 2

cost of 5 mental ability books = 19

:. cost of 1 mental ability book = 19/5

:. cost of 8 mental ability books = (19/5)×8

= 152/5

= Rs. 30.40

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