exam Maths Puzzle Numerical Ability

In simplifying expressions what is the rule for Adding together a large negative
number an a small positive number?
for example: -15+4

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exam Other Question

Please solve the following word problem:

Bob invested $20,000, part at 14% and part at 13%. If the total interest at the end of the year is $2,720, how much did he invest at 14%? How do you know if an expression has infinitely many solutions?