IBM Company Numerical Ability Arithmetic

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IBM Other Question
A student put points P and Q on a line to the right of point X. Three times the distance from point X to point P is four times the distance from point X to point Q. What is the ratio of PQ:XQ?
A grocer wishes to mix 6 pounds of Chippy dog food worth $3 per pound with Hippy dog food, worth $4 per pound. How much of the Hippy dog food should be mixed if the dog food mixture is to sell for $3.20?