At a fair cake-eating contest, Bobby ate three cakes in 20 minutes. At the same speed, how long did it take to win the contest by eating twenty-one cakes? Give your answer in minutes

140 minutes

Step-by-step explanation:

First divide 21 by 3 to get 7

Then do 20*7 to get 140 :)

2 hours and 20 minutes.

Step-by-step explanation:

20 minutes is ⅓ of a full hour. This means that 20 x 3 is equal to the number of minutes in a hour. So, Let's find out how much thirds 21 is equal to. We will divide 21 by 7.

21 divided by 7 is equal to 3.

The answer to the question is 2 hours and 20 minutes.

7 ft 6 in means 7 1/2, because 6 in is 1/2 of a foot. 7 ft 8 in means 7 2/3 because 8 in is 2/3 of a foot. 23/3 = 7 2/3. 15/2 = 7 1/2.

23/3   *   15/2   = 57 1/2

step-by-step explanation:

answer: 1+1

step-by-step explanation: 1+1 is at least 2