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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Linear systems of equations
x+y=11
x-y=10
where
x=
y= Solve each equation for x
x - a = -x + a + 4b

Solve each equation for y
y + 1/2 = -1/3(x + 1/2)

Fill in the tables using the given formulas
S = n(n+1)(2n+1)/6
n S