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Logan has $2.55 in dimes and nickles. How many dimes does he have if there are 12 less than double the number of nickles
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1 Nickel = 5 cents
1 dime = 10 cents
$1 = 100 cents
1 dime = 2 Nickel
Number of dimes = 2*Number of nickels - 12
Lets represent -
Number of dimes = d
Number of nickels = n
therefore, d = 2n-12
so, d+n = $2.55
or, 10*d + 5*n = 255 cents .....................(covert both sides into number of cents)
or, 10*(2n-12) + 5n = 255
or, 20n-120+5n = 255 => 25n = 375 => n = 15
therefore, d = 2n-12 = 2*15-12 = 18
Number of dimes = 18
Number of Nickels = 15
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