Joint variation problems

Solve:

1. y varies jointly as x and z. When x = 2, z = 5, y = 30. Find y when x = 4, z = 3.
2. p varies directly as q and inversely as r. When q = 6, r = 2, p = 9. Find p when q = 8, r = 3.
3. The volume V of a gas varies directly as temperature T and inversely as pressure P. When T = 300, P = 2, V = 600. Find V when T = 400, P = 4.

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