exam Maths Puzzle Numerical Ability

How would you solve this problem? I have tried and tried to solve this problem and I can't seem to find out the answer. It's multiple choice>


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{{{x * x -x-56}

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exam Other Question

Janet invested $13,000, part at 13% and part at 6%. If the total interest at the end of the year is $1,200, how much did she invest at each rate? Eric has 130 coins consisting of nickels and quaters. The coins combined value come to $15.90. Can you please help me find out how manyof each coin eric has.