book Maths Puzzle Numerical Ability

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

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book Other Question

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 The combined cost of one advance ticket to a show and one same-day ticket was $55. It is known that 30 tickets were sold in advance and 25 the same day, for total receipts of $1575 . What was the price of each kind of ticket?