exam Maths Puzzle Numerical Ability

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????

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exam Other Question
solve and graph:
8<x+2<13
How do I solve and graph these?

i=prt
Y=mx + b sally can paint house in 4 hrs and john in 6 hrs, how long together?