how many coins

Question

jamie and candy have a jar containing
68
?coins, all of which are either quarters or nickels. The total value of the coins in the jar is
?$ 8.40
How many of each type of coin do they? have?

Answer 1

Hi Jessica,

From the question, we know:

Q+N=68

and

Q(0.25)+N(0.05)=8.40

 

We can rearrange the first equation to solve for Q so that we get:

Q=68-N

 

We can then substitute 68-N in for Q in the second equation:

(68-N)(0.25)+N(0.05)=8.40

 

Solve for N, then plug its value into the first equation to solve for Q.