Question

The length of a rectangle is twice it’s breadth and the perimeter is 30cm what is its breadth.

Answer 1

Solution:

Dimensions of the rectangle:

Let breadth = b cm

Length (l) = 2b cm

Perimeter (P) = 30cm[given]

=> 2(l+b)=30

=> 2(2b+b) = 30

=> 2×3b = 30

=> 6b = 30

=> b = 30/6

=> b = 5 cm

Therefore,

breadth (b) = 5 cm

length (l) = 2b = 2×5 = 10cm

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Answer 2

l = 2b

perimeter p =2(l+b)

p=2(2b+b)

30=2(3b)

b=5

l=10