Jerome burned 75 calories in 15 minutes on a stationary bicycle how many calories will he burn in 25 minutes

For this one, you have to find the rate that he's burning calories. 75 calories in 15 minutes. So you divide 75/15 to get the per minute ratio. 75/15=5 so he burns 5 calories every minute. If he kept that up for 25 minutes, he would burn 5*25=125 calories