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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