exam Maths Puzzle Numerical Ability

Assume that y varies directly as x. Find y when x = 54 if y = 1/4 when x = 3/2.

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I am struggling with this word problem, I would like some help on how to complete these type of problems. Here is the problem: If 4 times an interger is increased by 3, the result is between 13 and 25. What is the interger? Please help me. Thank you can you tell me another way to write x (raised to 1/2 power)y(2/3 power)z(5/6 power) :this question is from a practice test for the compass exam x(1/2)y(2/3)z(5/6)