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math help i never got how to do this
Mary takes 3 hours to mow the yard. It takes Sally 5 hours. How long would it take with them mowing it together? Give the exact decimal answer ???have no clue how
2 Answers
- GlitterLv 51 decade agoFavorite Answer
It takes Mary 3 hours to complete the job. So in 1 hour, she would have completed 1/3 of the job.
It takes Sally 5 hours to complete the job. In 1 hour, she would have completed 1/5 of the job.
1/3 + 1/5
5/15 + 3/15
= 8/15
In 1 hour, working together, Mary and Sally would complete 8/15 of the job. To find out how many hours it takes, flip the fraction.
15/8 = 1.875 hours
It would take them 1.875 hours to mow the yard.
:)
