book Maths Puzzle Numerical Ability

How do I convert 9/16 to a percent?

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book Other Question

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 8 clocks and 5 watches cost $695 althogether. 3 clocks and 3 watches cost $300 altogether. How much more does each clock cost than each watch?