exam Maths Puzzle Numerical Ability

Average...

Determine the average of the two real numbers x/3 and 2x/5.

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In a triangle, the measure of the second angle is 10 more than twice the measure of the first angle and the measure of the third angle is 16 less than three times the measure of th An 80 % idodine solution is to be mixed with a 40% iodine solution. How much of each should be used to get 12,000 milliliters of a 64% iodine solution?