Question

If x and y varies inversely as each other and x = 2 when y = 40. Find x when y = 20

Answer 1

The expression x and y varies inversely as each other can be written as:

x=k/y

where k is a constant.

given,

x=2 when y=40

putting it into the equation:

2=k/40

k=80

now, when y=20

using the same equation:

x=80/20

x=4