Describe how you solved the following problem:
i have a jar filled with $100 worth of quarters, nickels, and dimes.
i have the same amount of each type of coin. how many total coins do i have in my jar?

First you make sure you have all your variables using same measurement - cents (since it is the smallest)

$100 = 100*100 cents = 100,000 cents
1 quarter = 25 cents
1 nickel = 5 cent
1 dime = 10 cents

the test of your problem said that:
     you have $100     in       i don't know how many coins   of quarters, nickels and dimes
         100,000          =                    X                            *      (25+5+10)

we have to find X:

100,000= X *(25+5+10)
100,000= X *40
X= 100,000/40
X = 2,500 coins

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