exam Maths Puzzle Numerical Ability

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%?

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exam Other Question
What is the measure of the angle of rotation with respect to two lines that intersect to form a 25° angle?
The choices:
1) 12.5 degrees
2) 25 degrees
3) 50 degrees
4) 100 degr Hi, ive been asked to answer the following questions, and having great difficulty, i have managed to answer the first question, (although with ALOT of help), but i was wondering if