Question

Vignesh bought 10 notebooks from market and cost was Rs.10 per notebook. Gautam got 7 notebooks of the same type.

A: Vignesh calculated the total amount like this:
10 x 10 + 10 x 7 = Rs.170

B: Gautam calculated the total amount like this:
(10 + 7) x 10 = Rs. 170

Which of the method is correct?

• A. Vignesh's method is correct.
• B. Gautam's method is correct.
• C. The method used by both of them is wrong.
• D. Nothing like this exists.

Answer 1

Answer: (A), (B)

The correct options are
A

Vignesh's method is correct.

B

Gautam's method is correct.

Total cost can be calculated as:

By first calculating the cost of individual purchase of both Vignesh and Gautam and then adding them
i.e. 10 x 10 + 10 x 7 = Rs.170

Or

First, calculate the total number of notebooks bought by them together and then find the total cost
i.e. (10 + 7) x 10 = Rs. 170

Hence, both the methods are correct.