Question

Q.7. Solve the following.
1. If 20 notebooks cost Rs. 160, then how much do 3/4 part of the notebooks from them cost ? formula
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Answer 1

Answer:

20 notebooks cost =Rs.160

3/4 part of notebooks is = 3/4×₹160

= 3×40

= 120.

Answer 2

Answer :-

Given :-

• 20 notebooks cost Rs. 160

To Find :-

• Then how much do 3/4 part of the notebooks from them cost.

Solution :-

Let's first find how much 1 notebook cost :-

→ 20 notebooks cost Rs. 160

→ Cost of one notebook = 160 / 20

→ Cost of one notebook = 8

Now, we are asked how much do 3/4 part of the notebooks from them cost.

→ Number of notebooks = 3/4 × 20

= 3 × 5

= 15

So, we have to find cost of 15 notebooks.

→ Cost of 15 notebooks = 15 × 8

= 120

Cost of 3/4 part of the notebooks i.e. 15 notebooks = Rs. 120