Question

Suppose a varies directly as b, and a =8 when b =3 find b when a =24

Answer 1

b=9

Explanation:

since a varies directly as b,

a=kb

k=a/b

k=8/3

but when a=24, b will be given by

b=a÷k

b=24÷8/3, b=24×3/8

b=9