book Maths Puzzle Numerical Ability

6.7 more than 5 times n what is that

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book Other Question

a local train leaves newark at 8:00am and travels west at an average speed at 40 mi/hr. At 9;00 am an express train leaves Newark on tracks parrallel to the local train and heads 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