Question

I don’t understand how i am supposed to get these numbers

Answer 1

We know that

• The students consumed 259 grams of carbohydrates.

,

• He also consumed 2231 total kcal.

The first step is to multiply the grams of carbohydrates by 4 because 1 gram of carbohydrate contains 4 kilocalories.

`259g\cdot4\cdot(kcal)/(g)=1026\text{kcal}`

So, in this first step, we are converting the number of carbohydrates into kilocalories because the percentage we want to calculate is about kilocalories. So, after the transformation, we know that 259 grams of carbohydrate are equivalent to 1026 kilocalories.

Now, as a second step, we have to divide the number of kcal we obtained from the transformation (1026 kcal) by the total number of kilocalories consumed (2231 kcal). This division will give us the percentage that represents the number of kilocalories among the total consumed.

`\frac{1026\text{kcal}}{2231\text{kcal}}=0.46`

However, the division is giving the answer in decimal numbers. To get it as a percentage, we have to multiply by 100.

`0.46*100=46`

The number 46 means that the number of kilocalories taken with the carbohydrates represents 46% of the total number of kilocalories this student consumed.