exam Maths Puzzle Numerical Ability

v - 7 divided by -7 simplify

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I need help solving the following problem:

For a resistor in a direct current circuit that does not vary its resistance, the power the resistor must dissapate is directly propor Mary has 84 coins that have a total value of 5.55$. if all the coins are nickels and dimes. How many of each does mary have?