Question

The cost of 5 Mental ability books is Rs. 90. What will be the cost of 8 such books

Answer 1

5 books = 90
1 book= 90/5= 16
8 books =16x8=128

Answer 2

Cost of 8 mental ability books is 144 Rupees.

Given:

• The cost of 5 Mental ability books is Rs. 90.

To find:

• What will be the cost of 8 such books ?

Solution:

Concept to be used: Apply unitary method.

Step 1:

Find the cost of one unit.

As,

Cost of 5 books are = 90 rupees

Cost of 1 book is = 90/5 rupees

Cost of 1 book is = 18 rupees

Step 2:

Multiply cost of one book with 8.

Cost of 8 books are = 18×8 rupees

Cost of 8 books are = 144 rupees

Thus,

Cost of 8 mental ability books is 144 Rupees.

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