Final answer:
To find out how much cake John will eat in 15 days, calculate half of the total amount he eats in 30 days. Since he eats 0.3 ounces a day, he will consume 4.5 ounces in 15 days.
Step-by-step explanation:
If John eats 0.3 ounces of cake for breakfast each day, and he does this for 30 days, we need to calculate how much cake he will eat in 15 days. We simply divide the number of days by 2, since 15 is half of 30, and then multiply the daily consumption by the number of days:
- Amount of cake John eats in 30 days = 0.3 ounces/day × 30 days = 9 ounces.
- Amount of cake John eats in 15 days = 9 ounces ÷ 2 = 4.5 ounces.
So, John will eat 4.5 ounces of cake in 15 days.