Variables
S = snickers
R = reece
Equations
[tex]\begin{gathered} S+2R=737 \\ 2S+R=778 \end{gathered}[/tex]Then, we solve the system of equations:
[tex]\begin{gathered} S+2R-2R=737-2R \\ S=737-2R \end{gathered}[/tex]Substitute S:
[tex]2\left(737-2R\right)+R=778[/tex]Simplify:
[tex]\begin{gathered} 1474-4R+R=778 \\ 1474-3R=778 \end{gathered}[/tex]Solve for R:
[tex]\begin{gathered} 1474-3R-1474=778-1474 \\ -3R=-696 \\ \frac{-3R}{-3}=\frac{-696}{-3} \\ R=232 \end{gathered}[/tex]Substitute R = 232 in S:
[tex]S=737-2(232)=737-464=273[/tex]Answer:
Snickers bar: 273 calories
Reese's Peanut Butter Cup: 232 calories