Question too long, is in details.

Question

The volume of a gas in a container at a constant temperature varies inversely as the pressure. The volume is 22 cubic centimeters at a pressure of 7 pounds. Use a proportion to find the pressure when the volume is 42 cubic centimeters.

Answer 1

A proportion is not usable in this case - inverse relation.

x₁y₁ = x₂y₂

 

22(7) = 42(p)

154 = 42p

3 2/3 = p

 

The pressure is three and two-thirds pounds.