A rectangle has 15 cm as its length and 150 cm 2 as its area .Its area is increased to 1 1 / 3 times the original area by increasing only its length . Its new perimeter is?

50 cm
60 cm
70 cm
80 cm

Correct Answer: 60 cm

Explanation:

Breadth of the rectangle = (150/15) cm
= 10 cm
New area = (4/3 x 150) cm²
= 200 cm²
New length = 200/10 cm
=20 cm
New perimeters = 2(20 + 10) cm
= 60 cm

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