Question

If X varies inversely as y and y = 60 when X=1.5 . Find X when y is = 4.5 .

Answer 1

If x varies inversely to y then ,

xy = constant ( k )

1 ) x = 1.5 , y = 60

k = xy = 1.5 × 60

k = 90

2 ) y = 4.5 , x = ? , k = 90

xy = k

x = k/y

x = 90/4.5

x = 20