book Maths Puzzle Numerical Ability

I have three word problems that I'm stuck on could you help me please?

1. Connor has nickels, dimes, and quarters. He has a total of $25.20. He has twenty-one fewer nickels than

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I'M having a problem trying to solve this [(-3,3),(-1,1),(0,o),(2,2),(4,4)] I am looking for help on this problem any help i would really be thankful

Elaine was charged $195 interest for 1 year on a $1000 credit card balance. What was the monthly interest rate?