The length and breadth of a rectangle are raised in the proportion 3 4 and 4 5 correspondingly What ...........

Quantitative Aptitude ( CCS) Ratio, Proportion

The length and breadth of a rectangle are raised in the proportion 3:4 and 4:5 correspondingly. What is the ratio of area previous place to the new?

3:8

5:8

6:1

3:5

-> If the real length = 3a
And the real breadth = 4a
Area = (3a)*(4a)
=12 a2

-> New Length is 4a and New breadth is 5a
New area is (4a)*(5a)
= 20 a2
Ratio of previous place to new place = 12 a2 : 20 a2
= 12 : 20
= 3 : 5

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