Question

A towel, when bleached, was found to have lost 20% of its length and 10% of its breadth. The percentage of decrease in area is:
A. 10% B. 10.08%
C. 20% D. 28%

Answer 1

@Mimi_x3 @mayankdevnani

Answer 2

Let original length = x and original breadth = y.

Answer 3

Thanks

Answer 4

Decrease in area = \[xy - [\frac{80}{100}x \times \frac{90}{100}y]\]
\[=xy-\frac{18}{25}xy\]
\[=\frac{7}{25}xy\]
so , decrese %=\[\frac{7}{25}xy \times \frac{1}{xy} \times 100=28 % \]