Question

The length of a rectangle is twice its breadth if its perimeter is 30cm find the area of the rectangle

Answer 1

breadth =x
length=2x

perimeter= 2(l+b)
=2(x+2x)
=2(3x)

then
30=2(3x)
15=3x
5=x
breadth=5
length=2×5
=10
area=l×b
=5×10
=50