A gram of carbohydrates and a gram of protein both have 4 Calories. What percent of the Calories in each food are from carbohydrates? Round your answer to the nearest percent.

Charts
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Macaroni & Cheese | Spaghetti & Meat Sauce |
------------------| --------------------
Carbohydrates | 40 g | Carbohydrates | 39 g |
Protein | 10 g | Protein | 19 g |

Question

A gram of carbohydrates and a gram of protein both have 4 Calories. What percent of the Calories in each food are from carbohydrates? Round your answer to the nearest percent.

Charts
                         ---------       
Macaroni &  Cheese   |    Spaghetti & Meat Sauce  |
------------------|   --------------------
Carbohydrates | 40 g |     Carbohydrates   | 39 g  |
Protein            | 10 g |          Protein          | 19 g  |

raxis · Answer

first you figure out how many calories there are total; in Mac and Cheese you've got 50 grams, with 4 calories per (since they're equal, we don't worry about separating them)  so that's 200 calories total. Now we have 40 grams of carbos with 4 calories per gram, for 160 grams altogether. 160 over 200 is .8. Move the decimal to the right two slots and you get a clean 80 percent :) You can figure out the other problem from that, yeah?

anonymous · Answer

Is it 67.2%? Rounding off to 68%.

raxis · Answer

Bingo :)

anonymous · Answer

OH YEAAAA!! Thank you!! :D After I saw what you put, I realized how easy it was.. ;P Thanks!

raxis · Answer

Haha, no problem.