Question 68

A cloth was 50 cm broad and 8 cm long. When washed, it was found to have lost 25% of its length and 14% of its breath. Then the percentage decreased in area is ..........

Solution

A cloth was 50cm broad and 8 cm long.

Original Area $$=50cm\times 8cm = 400 cm^2$$

When washed, it was found to have lost 25% of its length and 14% of its breath.

New Area $$= 0.75\times 50cm \times 0.84\times 8cm = 258 cm^2$$

The percentage decreased in area $$\frac{400-258}{400} =35.5\%$$

Option B is correct.

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