Mensuration Practice Test 8

Question : 25 of 40

Marks: +1, -0

A rectangle has 30 cm as its length and 720 sq. cm as its area, Its area is increased to

1 1/4

times its original area, by increasing only its length. Its new perimeter is:

Solution:

Length = 30 cm
Area = 720 sq cm
Breadth of rectangle = b
b =

{720}/{30}

= 24 cm
Area is increased

1 1/4

times.

720 × 5/4

900 cm^2

Length increased =

{900}/b

{900}/{24}

= 37.5 cm
Perimeter of the rectangle = 2 (l + b)
= 2 (37.5 + 24)
= 2 (61.5)
= 123 cm

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