exam Maths Puzzle Numerical Ability

Beatriz is in charge of setting up a banquet hall. She has 5 tables that will seat 6 people each. if no more than 62 people will attend, how many tables seating 4 people each will she need?

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exam Other Question

The sum of two numbers is 15. Three times one of the numbers is 11 less than 5 times the other. Find the numbers Solve for x: 9(^2x-1)= (81^(x+1)(27^-x) I think the answer is -2??????