Question

the ratio of the length of the field to its width is 5 : 3 find the length if the width is 42 metres

Answer 1

l:b = 5:3
l/42=5/3
l=5×42/3
l=30 metres

Answer 2

5x+3x=8x
x=42/8
x=5.25
length =3x
3×5.25
15.75
approx 16