Question

the length of a rectangular hall os 3m more than double of its breadth. it's perimeter 66m, what is the length of it

Answer 1

let the breadth be x m
then length= 2x+3 m.
Perimeter=66m
2(l+b)=66
2(x+2x+3)=66
2(3x+3)=66
3x+3=66/2
3x+3=33
3x=33-3
3x=30
x=30/3
x=10


length=2×10+3=20+3=23m

Answer 2

l = 3+2b
b=b
66=2(l+b)
66=2(3+3b)
66=6(1+b)
66÷6=1+b
b=11-1
b=10
l=3+2b
=3+2×10
=3+20
=23