book Maths Puzzle Numerical Ability

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

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book Other Question
how many centimeter in one decimeter 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