exam Maths Puzzle Numerical Ability

Find A ∩ B if A = {4, 7, 10, 13, 17} and B = {3, 5, 7, 9}.

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exam Other Question

The lengths of the two bases of an isosceles trapezoid are 8 and 14. If the length of an altitude of the trpaezoid is 4, find the length of a leg. I dont understand how to solve problems such as this....
5x-16=3x