exam Maths Puzzle Numerical Ability

If you have a 5% solution and a 50 % solution how much of each solution do you need to make 20ml of 30% solution?

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exam Other Question

116 is divisible by how many numbers? The annual cost in dollars for removing p% of the toxix chemicals from a town's water supply is given by the formula C(p)=500,000/100-p

a)Use the accompanying graph to estimate