DP CONSTABLE MATHS -MENSURATION 2D-04

Question 1:

If each side of a rectangle is increased by 12%, then by what percentage will its area increase?

0.1265

0.275

0.2544

0.1854

Question 2:

If the length of a rectangle is increased by $80 \%$, what would be the percentage decrease (correct to one place of decimal) in the width to maintain the same area?

$44.4 \%$

$42.5 \%$

$40.2 \%$

$43.5 \%$

Question 3:

If the sides of a square are increased by $30 \%$, then find the percentage increase in its area.

$65 \%$

$68 \%$

$79 \%$

$69 \%$

Question 4:

The ratio of length and breadth of a rectangle is $3: 1$. If its perimeter is $96 \mathrm{~m}$, then what will be the length of the rectangle?

$48 \mathrm{~m}$

$24 \mathrm{~m}$

$36 \mathrm{~m}$

$12 \mathrm{~m}$

Question 5:

The length and the breadth of a rectangle are made to increase and decrease, respectively, by 8% and 10%. What is the percentage increase or decrease in its area?

Decrease by 1.8%

Increase by 1.8%

Decrease by 2.8%

Increase by 2.8%