Question

two sides of a rectangle are 20cm and 10cm. They are increased in the ratio 2:3 and 3:7. Find the percentage increased in its area?

Answer 1

the way I understand the wording .....

new length/20 = 3/2
new length = 30

new width/10 = 7/3
new width = 70/3

new area = 30(70/3) = 700
old area = 20(10) = 200
increase = 500
percentage increase = 500/200 * 100% = 250%

Answer 2

herefore, new area of rectangle = xy

Original area = 20 × 10 = 200 cm2

Therefore, increase in area of rectangle = new area of rectangle - original area = 700 cm2 - 200 cm2 = 500 cm2

Now, percentage increase in area