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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book Other Question
What are the length and width of a rectangle that has a perimeter of 98 cm and a diagonal of 35 cm? Now I have the problem. I just want to check this one.

-6-(-7)-15-(-12)=?

We are coming up with -2. Is this correct?

Thanks,
Jeff