exam Maths Puzzle Numerical Ability

Suppose that one solution is 50% alcohol and another solution is 80% alcohol. HOw many liters of each solution should be mixed to make 10.5 liters of a 70% alcohol solution?

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exam Other Question
(c^3-2c^2-5c+3)+(c^2+2c-1) Find all the errors in the following solution to an equation:
7/x = 8/x+3 +1

7(x+3) = 8x + 1
7x + 3 = 8x
-x = -3
x= 3