Question

R is inversely proportional to A.

R = 12 when A= 1.5
a) Work out the value of R when A = 5.
b) Work out the value of A when R = 9

Answer 1

R = 40

A= 1.125

Explanation:

12(R) ÷1.5(A) =8

1.5(A) x 8 = 12(R)

1.5(A) x 8 = 12(R) 12(R) ÷ 8 = 1.5 (A)

for 1.5 = 12, you need to times 8

A = 5 and you want to get to R so you times by 8

5 x 8 = 40 | R = 40

R = 9

9 ÷ 8 = 1.125

A = 1.125