exam Maths Puzzle Numerical Ability

Angus invested $18,000, part at 3% and part at 5%. If the total interest at the end of the year is $660, how much did he invest at each rate?

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please help me solve this problem: the distance of around a rectangle field is 2000 feet, the length is 800 feet what is the width? would it be 1200ft? 2x + y = 3 with no given numbers