The average 169 pound person burns 7.9 calories per minute while backpacking. How many calories would a person of this weight burn while backpacking for 75 minutes?

Answer 1

Let's use unit-analysis to determine how to set up the equation...

Using the avg person of 169 lbs, we know that 7.9 calories are burned every minute. How much in 75 minutes?

7.9 cal 75 min. = 592.5 cal

--------- x

min

Notice how the time unit shows in the numerator of the second fraction and the denominator of the first fraction, this allow those to "cancel" and be left with calories as the only unit remaining, which is what we want...

Answer 2

7.9*75=592.5 calories