exam Maths Puzzle Numerical Ability

5+y= 14
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y-3 10

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exam Other Question

I am haveing trouble with multiplying binomials using the FOIL method and useing squares, is there an easyer way to do this and how do I do squares? 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%?