- #1
Kyoma
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1. The problem statements, all variables and given/known data
a. 12 workers took 6 hours to complete 2/3 of a job. To speed up the work, another 6 workers were hired. How many more hours of work are needed before the job is completed?
b. It takes a painter 6 hours to paint 2 rooms. His assistant takes 4 hours to paint one room. If both of them were to work together, how many hours will it take for them to paint one room?
c. For a camp, food is brought to last for 15 days for a group of 40 students. If 4 students left the camp after 6 days, how many days can the food last for the remaining 36 students?
2. The attempt at a solution
a. I have no idea.
b. The speed of the painter is 1/3 room per hour while the assistant's speed is 1/4 room per hour, so if they work together, the speed will be 7/12 room per hour. Thus, 1 room will take 12/7 hours. I'm not sure with this.
c. I have no idea.
Thanks.
a. 12 workers took 6 hours to complete 2/3 of a job. To speed up the work, another 6 workers were hired. How many more hours of work are needed before the job is completed?
b. It takes a painter 6 hours to paint 2 rooms. His assistant takes 4 hours to paint one room. If both of them were to work together, how many hours will it take for them to paint one room?
c. For a camp, food is brought to last for 15 days for a group of 40 students. If 4 students left the camp after 6 days, how many days can the food last for the remaining 36 students?
2. The attempt at a solution
a. I have no idea.
b. The speed of the painter is 1/3 room per hour while the assistant's speed is 1/4 room per hour, so if they work together, the speed will be 7/12 room per hour. Thus, 1 room will take 12/7 hours. I'm not sure with this.
c. I have no idea.
Thanks.