Question

Suppose j and k vary inversely, and k=3 when j=12. Find k when j=18.

2
4
24
36

Answer 1

k = 2.

Explanation:

j = c/k where c is a constant.

When k = 3, j = 12 so

12 = c/3

c = 36.

So the relation is j = 36/k

When j = 18

18 = 36 / k

So 18k = 36

k = 2.