Question

The perimeter of a rectangle is 80cm. If the length is doubled and the breadth is trebled, the
perimeter increases by 110cm. The area of the rectangle is
[cm²
1) 385
2) 375
3) 350
4) 320​

Answer 1

Step-by-step explanation:

If the length & breadth are 3 & 2 units respectively, the perimeter => 2(Length+Breadth) = 2(3+2) = 10 units.

Here, 10 units correspond to 100 cm,

So 1 unit corresponds to 100/10 = 10cm.

Thus, length and breadth are actually 3*10 = 30 cm and 2*10 = 20 cm respectively.

Required Area = Length * Breadth = 30*20 = 600 sq cm.