The length of a rectangle is half the width. Find the length of the rectangle if the perimeter is 42 cm.

All you have to do is divide 42 by 2 42 ÷ 2=21 would be your answer if you divided it correctly that would be your answer!

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.