book Maths Puzzle Numerical Ability

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

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book Other Question

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% In any triangle, the sum of the measures of the angles is 180 degrees. In triangle ABC, angle A is 4 times as large as angle B. Angle C measures 20 degrees less than angle B. Find the measure of each angle.