book Maths Puzzle Numerical Ability

If 75 percent of a class answered the first question on a certain test correctly, 55 percent answered the second question on the test correctly, and 20 percent answered neither of

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Could you please show me all steps to solve the following:

This year Jenny is twice as old as Bev. Next year the sum of their ages will be 50. A third friend Rachel is three qua
A monthly water bill in a certain city is calculated by using the formula:

n= 8500c-64000/4



where n is the number of gallons used and C is the monthly cost.Solve f