exam Maths Puzzle Numerical Ability

Pressure varies inversly as volume. When the pressure is 16 pascals, the volume is 84 liters. What would the volume be if the pressure is reduced to 12 pascals?

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I need help on a few problems. The first one I tried is (radical sign)x-6 +8=x
I started by subtracting 8, so I got (radical)x-6 =x-8, then I think you square each, and now I am Find the Area of a rhombus that contains a 60 degree angle and whose larger diagonal is 24'.