Question

If x and y vary inversely and x= 25, when y= 3, find y, when x= 15

Answer 1

Since x and y are inversely proportional,

x= y/k where k is a constant.

Given x = 25 and y = 3.

Therefore, 25 = 3/k

k = 3/25

when x=15, x =y/k

y = k × x

=(3÷25) ×15

=9/5