exam Maths Puzzle Numerical Ability

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%?

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exam Other Question

Two students have 920$ altogether. How much does each have if 5/7 of the money of the first one is equal to 3/5 of the money of the second student?

Please help !! I do not understand these problems at all, could someone please help me?

The following equation represents an ellipse. True or False?
(x-3)^2/1 + (y+1)^2/25