exam Maths Puzzle Numerical Ability

Find all sets of three consecutive odd integers whose sum is between 20 and 30

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exam Other Question

{[18-2*7]-[40/(17-8)]}+{49-13*3+[(51-7*6)+2]} rex scores of 85,92,87,88 and 91 on first five exams. what score must he make on the sixth exam to have an avg of 90 or better for all six exams?