Sonji has $5.25 in nickels and dimes. the coin value can be modeled by the equation 0.10 d plus 0.05 n equals 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?

35
42
63
105

Step-by-step explanation:

Here we just have to take the given expression, and replace the amount of dime Sonji has.

So, we know that the situation is modeled by:

Where and are dimes and nickels respectively. The model make totally sense, because each dime values 10 cents or $0.10, and each nickel values 5 cents or $0.05.

So, if Sonji has 21 dimes, we replace this in the model and solve for :

Therefore, according with this result, Sonji has 63 nickels.

the answer will be