Question

The perimeter of a rectangular plank is 120 cm. If the length is 40cm, find its breadth and surface area of the plank.

Answer 1

Answer:

Step-by-step explanation:

Perimeter = 2 (l + b)

2 (l + b) = 120

2 (40 + b) = 120

40 + b = 60

B = 20 cm.

Area of plank = l × b

= 20 × 40

= 800 cm^2.

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Answer 2

2(l+b)=120
2(40+b)=120
80+2b=120
b=20
area =20×40=800cm square