Question

area of rectangle with length 10dm is 60 dm. find its perimeter

Answer 1

l=10 dm Area=60 dm²
area of rectangle=lb
b×10=60
b=6 dm
Perimeter of rectangle=2(l+b)
=2(10+6)
=2×16
=32 dm
Hope it helps you

Answer 2

10dm×x=60dm
60÷10=x
x=6dm
...

perimeter=2(l+b)
2(10+6}
2×16
=32dm