exam Maths Puzzle Numerical Ability

Jacob has a box of bills. There are five more $10 bills than $5 bills, but two less $2 bills than $5 bills. He saved $148. How many of each bill did he save?

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I need help simplifing radicals, the problem says to express in simpliest radical form: radical 3x/2y Problem Solving: How to solve:
Supppose you have 10 coins that total $0.85. Some coins are dimes and others are nickels. How many of each do you have????