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This problem trains for: SAT-I, AMC-8, GMAT, AMC-10.
If x varies directly with d2 and indirectly with p2 what happens to x if p/d is doubled?
The dependency of x on d and p is of the form:
where k is some real constant.
We can rewrite the equality above as:
If the ratio p/d doubles:
x is quartered.