exam Maths Puzzle Numerical Ability

I got to find the constand of variation k



m varies directly with n; m=144 when n = 8

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roise's palm pirates, a manufacturer of electronic organizers, estimates that when x hundred palm pirates are made, the average cost per unit is given by C(x)=0.4x^2-3.68x+9.524 An emoplyer has a daily payroll of $1225 when employing some workers at $80 per day and others at $85 per day. When the number of $80 workers is increased by 50% and the number of