The number of calories you burn depends on your weight. A 130 pound person burns 89 calories during 30 minutes of bowling. Find the number of calories that a 190-pound person would burn during the same activity, assuming they burn calories at the same rate.
"rate" is the keyword here. You'll need to come up with a "direct variation" relationship between c (number of calories burned) and w (person's weight):
c=kw
You are told that when w=130 lb, c = 89 calories. Find the constant of proportionality, k.
Then rewrite c=kw with this value of k substituted.
Finally, substitute 190 lb. for w in your formula and calculate the # of calories burned, c.
