book Maths Puzzle Numerical Ability

Suppose W varies directly as x and y and inversely as Z, and W=48 when X=2, Y=8 and Z=12. Find W when X=12, Y=6 and Z=24.

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book Other Question
4(x-2)+5(3x-4)=0
How do you figure out what x is? From a group of 6 men and 4 women, a committee of 3 is to be selected at random. Find P(at least 2 women).