exam Maths Puzzle Numerical Ability

Solve each equation.Check each solution.

23-2t=15-t

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exam Other Question

Find the smallest whole number that when divided by 5,7,9, and 11, respectively, gives remainders of 1,2,3,and 4. Need help,
5^2x=5^(x^2-12) The parenthesis means the exponent of 5.
For the first step I have 2xln5=(x^2-12)ln5 but now I'm not sure how to finish the problem.