There is 150 calories contained in each sandwich
Two variables are said to be proportional or have a proportional relationship when they have equivalent ratios. That is they increase or decrease by a factor.
Let x represent the number of calories per sandwich.
Hence:
x = Total calories / total number of sandwich
x = 1800 calories / 12 sandwiches
x = 150 calories per sandwich
Hence, there is 150 calories contained in each sandwich
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