Question

if length =8cm ,breadth=x-5cm and the perimeter is 40 cm.Make an equation and find x

Answer 1

perimeter =2(l+b)

so,

40=2(8+(x-5))

20=8+x-5

20=3+x

x=17

so,

breadth=x-5=17-5=12

Answer 2

perimeter of rectangle = 2 ( l + b )
40 = 2 ( 8 + x-5 )
40 = 2 ( 3 + x )
40 = 6 + 2x
40-6 = 2x
34 = 2x
34/2 = x
x = 17
length = 8 cm
breadth = x-5 = 17-5 = 12

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