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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((( cindy has $6.05 in quarters and nickels. How many of each coin does she have if there are 53 coins in all.)))) Can you please help me set up this problem Hi,

I need help with finding the LCM
x^2+x-6;x^2+8+15;x^2-25

Thanks