The total amount of money (in cents) in x nickels, (x+3) dimes, and 2x quarters. (hint: the

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The total amount of money (in cents) in x nickels, (x+3) dimes, and 2x quarters. (hint: the value of a nickel is 5 cents, the value of a dime is 10 cents, and the value of a quarter is 25 cents) The "hint" baffles me

Why is the value of coins important in this equation?