exam Maths Puzzle Numerical Ability

Pure acid is to be added to a 10% acid solution to obtain 21L of a 40% acid solution. what amount of each should be used?

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A search plane has a cruising speed of 250 miles per hour and carries enough fuel for at most 5 hours of flying. If there is a wind that averages 30 miles per hour and the directio A student has a total of 244 points from 3 tests. The first test score was 20 more than the second test score. The sum of the second and third test scores was 60 points more than the first test score. Find each test score.