Question

Caleb spends 72.50$on$50$hamburgersforthemarchingband.Ifsingleburgerscost$\ $1.00$ each and double burgers cost 1.50$ each, how many double burgers did he buy?

• A. $45$.
  
• B. $40$.
  
• C. $50$.
  
• D. $55$.
  

Answer 1

The correct option is A $45$.

Let $5=$ the number of single burgers purchased.

Let $d=$ the number of double burgers purchased.

$s+d=50$

$s+1.5d=72.50$

Combine the two equations by subtracting equation $1$ from equation $2$.

$s+1.5d=72.50$

$\underset{–}{-(s+d=50)}$

$0.5d=22.5$

$d=45$.