exam Maths Puzzle Numerical Ability

Sam emptied his collection of nickels and dimes on his bed. If his 46 coins were worth $3.10,how many coins of each type did he have?

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exam Other Question

Please help me solve this equation: (8/3n)-(15/5n^2) Ver confused with this one Solve sytem of linear equation express in ordered pai (x,y) if possible use substitution or addition method

x- 5/3y=7
4/7x + y=-13/7

thanks, please show me steps

dnn