Posted by **ASDFG** on Thursday, July 19, 2012 at 11:02am.

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?

- MATHS -
**Reiny**, Thursday, July 19, 2012 at 2:36pm
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%

- MATHS -
**Ruby Siaosi**, Wednesday, January 16, 2013 at 7:53pm
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

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