exam Maths Puzzle Numerical Ability

Fred bought 3 shirts, each at the same price, and received less than $2.oo change from a $20.00 bill. What is the minimum cost of one shirt?

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Can someone please help me with this problem??
Simplify the expression; assume that all the variables represent positive numbers.
(625x^4y)^1/4
______________
(16xy^3)3/4

Thank You so much Use FOIL to multiply:
(6x � 1)(3x � 4)