How do you set up an equation for finding price of candy bars knowing you sold 60 candy bars and 110 drinks for $265?

Question

The math club sells candy bars and drinks during football games. 

60 candy bars and 110 drinks will sell for $265. 

120 candy bars and 90 drinks will sell for $270. 

How much does each candy bar sell for?

Answer 1

b = number of candy bars

d = number of drinks

 

60b + 110d = 265

120b + 90d = 270

 

Multiply top equation by two

 

120b + 220d = 530

120b + 90d = 270

 

Subtract bottom from top

 

130d = 260

d = 2 

 

Drinks cost $2.00. Substitute this into any equation above to determine the price of candy bars.