How much is 50% of 10 liters of milk? How far is 50% of a 2,000-kilometer trip?
How long is 50% of a 24-hour day?
How can you find 50% of any number?

The number of calories you burn depends on your weight. a 110-pound person burns 163 calories during 30 minutes of tennis. find the number of calories that a 190-pound person would burn during the same activity, assuming they burn calories at the same rate.