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

Find a basis for the subspace R^4 consisting of all vactors of the form (a + b, b+c, a-b-2c, b + c), what is the dimesion of the subspace? You put 137 miles on your car for one day. During the 5 day workweek , you put a total of 350 miles in your car. How many miles on an average did you drive for the remainder of the four - day period?