exam Maths Puzzle Numerical Ability

Fred bought three shirts each at the same price, and received less than $12.00 in change from a $50.00 bill.
a. what is the minimum cost of one shirt
b. what is the maximum cost of one shirt

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exam Other Question

A student was given the following problem: 4x^2 -9/4x^2 +12x + 9 divided by 6x -9 . He states his answer to the problem as 3(2x -3). Is he correct? If not, explain why. What would you suggest he do to solve the problem?
I have a log question... I am having a hard time setting up this problem... please help me..

log 25=x
5

and

log (5)^-2
5

can you please help me thank you.....