exam Maths Puzzle Numerical Ability

R(r1 + r2) = r1r2, for r2

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exam Other Question

If prices,P, are reduced by 20% and sales are increased by 25% what is the effect on the total recepiets?
(a)increased by 5% (b)decreased by 5% (c)are unchanged (d)none of Find two numbers such that twice the first exceeds three times the second by 1, and three times the first exceeds twice the second by 14.