Answer
Each Mr. Goodbar has 264 calories and each Mounds bar has 258 calories
Work Step by Step
g = calories in one Mr. Goodbar
m = calories in one Mounds
g + 2m = 780
2g + m = 786
2g + m = 786 can be written as m = 786 - 2g. Plug this into g + 2m = 780
g + 2(786 - 2g) = 780
g + 1572 - 4g = 780
-3g = -792
g = 264
Each Mr. Goodbar has 264 calories
Plug in g into g + 2m = 780
264 + 2m = 780
2m = 516
m = 258
Each Mounds bar has 258 calories
