A cup of skim milk has 10 more than half the calories of a cup of whole milk. a cup of whole milk has 40 more calories than a glass of apple juice. If someone consumed a cup of each of the three, they would have 370 calories. how many calories must be in each?

1) s= w/2+10
2) w=a+40 (or a=w-40)
3) a+s+w=370

rewriting 3)...






then we find the others:

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