David exercises every day. he spends 40% of his exercise time on the treadmill. if he uses the treadmill 40 minutes each day, how many minutes does he exercise each day?

David exercises 100 minutes each day.

Step-by-step explanation:

1. Let's review the information given to us to answer the question correctly:

David uses the treadmill 40 minutes each day = 40% of his exercise time

2. How many minutes does he exercise each day?

Let's use the Direct Rule of Three to answer this question:

Minutes        Percentage

40                    40

 x                      100

40 * x = 40 * 100

40x = 4,000

x = 4,000/40

x = 100

David exercises 100 minutes each day.

if x = 1, then the answer is 3.5