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If 100 g of your certain food gives 300 calories then:

30 g/ 100 g = 0.3

0.3 x 300 calories = 90 calories.

So 30 g has 90 calories.

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Q: If there is 300 calories in 100 grams of a certain food how many calories are there in a 30 grams portion of this food?
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