Sonji has $5.25 in nickels and dimes.The coin value can be modeled by the equation 0.10d + 0.05n = 5.25, where d represents the number of dimes and n represents the number of nickels. If Sonji has 21 dimes, how many nickels does she have?
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Sonji has $5.25 in nickels and dimes.The coin value can be modeled by the equation 0.10d + 0.05n = 5.25, where d represents the number of dimes and n represents the number of nickels. If Sonji has 21 dimes, how many nickels does she have?
.10 (21) + .05 n = 5.25
2.10 + .05n = 5.25 subtract 2.10 from both sides
.05n = 3.15 divide both sides by .05
n = 3.15 / .05 = 315 / 5 = 63 nickels
