Question 182579
I just need to know the formula for this question: 
A child saved $3.70 in nickels and dimes. If the child has twice as many nickels as dimes. How many nickels does the child have?
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Equation:
value + value = value
5n + 10d = 370
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quantity = quantity
n = 2d
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Solve by substitution.
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Cheers,
Stan H>