Question

Find the length and breadth of the rectangle if its perimeter is 72 length is 5 x + 4 breadth x - 4

Answer 1

Explanation:

perimeter of rectangle = 72. 2 ( l+ b) = 72 2( 5x+4+x-4)= 72. 2×6x= 72. 12x=72. x= 72÷12. x= 6. length = 5×6+4 = 34. breadth =6-4=2

Answer 2

formula for perimeter of rectangle:2(l+b)

given data,

perimeter=72

lenght=5x+4

breadth =x-4

so,

2(5x+4+x-4)=72

10x+8+2x-8=72

12x=72

x=72÷12

x=6

length =5x+4=5(6)+4=30+4=34

breadth =x-4=6-4=2

therefore l=34

and b=2