exam Maths Puzzle Numerical Ability

Carla invested $28,000, part at 14% and part at 9%. If the total interest at the end of the year is $3,370, how much did she invest at 14%?

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exam Other Question

How do you do this system of equation:
3x+5y=56
y= 66-8y / 5
A cyclist traveling at a constant speed completes 3/5 of a trip in 1 1/2 hrs. In how many additional hours will the cyclist complete the entire trip?