Question

Math work-related tasks

Francine can make a dress in 18 hours.Her mother can make a dress in 6 hours. They decide to work together . How long will it take them to make a dress ? Choose from the answers below .

A.4 hours
B. 4 hours and 30 minutes
C. 5 hours
D. 12 hours

Answer 1

D. 12 hours

Explanation:

I am guessing that they want you to find the average time together, or the mean.

Add 18 hours and 6 hours together to get 24 hours.

To get the average, you have to divide the total hours by the amount people involved.

Since there are 2 groups (2 people) that have an outcome of 18 hours and 6 hours, 24 hours/2 people is a 12 hour average.