book Maths Puzzle Numerical Ability

Two vats contains cream, one sample tested 8% butterfat and the other tested 16% butterfat. How much cream should be taken from each to produce a 5 liters mixture w/c will test 12%

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book Other Question

the hypotinuse of a right triangle is 6 m long. one leg is 1 m longer than the other. find the length of the shorter leg. round to the nearst hundred. X is 6 years younger than Y, and the average of their ages is twice X age 5 years ago, how old are they?