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27 votes
My question asks; at an ice cream parlor, ice cream cones cost $1.10 and Sundaes cost $2.35. One day the receipts for a total of 172 cones and Sundaes were $294.20. How many cones were sold?

User Abidinberkay
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1 Answer

13 votes
13 votes

Data:

ice cream cones: x

sundaes: y

Total receipts :T


T=1.10x+2.35y

As the total of cones and sundaes is 178:


x+y=172

The total receipts were: $294.20


294.20=1.10x+2.35y

1. Solve one of the variables in one of the equations:

Solve x in the first equation:


\begin{gathered} x+y=172 \\ x=172-y \end{gathered}

2. Use this value of x in the other equation:


\begin{gathered} 294.20=1.10x+2.35y \\ 294.20=1.10(172-y)+2.35y \\ \end{gathered}

3. Solve y:


\begin{gathered} 294.20=189.2-1.10y+2.35y \\ 294.20-189.2=-1.10y+2.35y \\ 105=1.25y \\ (105)/(1.25)=y \\ y=84 \end{gathered}

4. Use the value of y=84 to find the value of x:


\begin{gathered} x=172-y \\ x=172-84=88 \end{gathered}

Then, the ice cream parlor sold 88 cones and 84 sundaes
User Yunus Aslam
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