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The volume $$V$$ of a fixed amount of a gas varies directly as the temperature $$T$$ and inversely as the pressure $$P .$$ Suppose that $$V = 70 cm ^ { 3 }$$ when $$T = 420$$ kelvin and $$P = 18 \frac { kg } { cm ^ { 2 } }$$ . Find the temperature when $$V = 60 cm ^ { 3 }$$ and $$P = 7 \frac { kg } { cm ^ { 2 } }$$