book Maths Puzzle Numerical Ability

which of the numbers 51,81,and111 is a composite number? (P.S thank you so very much)

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book Other Question

Use the quadratic formula to solve the equation: 24x^2-14x=6. Round your answer to the nearest hundredth. find the value of t of the following problem.
5t+7/2=3t+5/4+2t+3