book Maths Puzzle Numerical Ability

5(x+5)=25+5x

a) -5 b) 0 c) all real numbers d) no solution

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book Other Question

The revenune of a small concert promoter depends on the number of unsold concert seats. If 100 seats are sold, the price is $50. Each unsold seat increases the price per seat by $1 Ralph spent 5/9 of an hour mixing paints and 7/9 of an hour painting. How much time in all did Ralph spend on his project?