exam Maths Puzzle Numerical Ability

This question is not in the book, but one that my teacher gave us to try.
The shipping department for a warehouse has noted that if 60 packages are shipped during a month, the to

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exam Other Question

Find the sum or difference.

15. 5/12 - (-1 1/12)

Any help with this equation would be <b>GREATLY</b> appreciated.
Suppose that a certain radioactive substance has a half-life of 20 years. If there are presently 2500 milligrams of the substance, how much, to the nearest milligram, will remain after 50 years?