book Maths Puzzle Numerical Ability

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

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I am a distance learner and I am having difficulty solving this equations. My book has no examples and I am utterly lost.

Solve:

1/2x + 1/x = 3/8

Solve:

x/5 = x 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