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xmhllo
25.07.2019 •
Mathematics
Janet can do a job in 3 hours while garry can do the same job in 2 hours. if janet works for an hour before garry her, how long will it take them to finish the job together?
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Ответ:
Thus, I write:
2/3 job
= time required for the 2 to finish the job
1 job 1 job
+
3 hr 2 hr
The LCD here is 3(2) = 6. Mult. (2/3 job) by 6 results in 4 job, and
mult (1 job)/(3 hr) by 6 results in 2 job/hr, and mult (1 job)/(2 hr) by 6 results in 3 job /hr:
4 job 4 job
= = (4/5) hr (answer)
2 job/hr + 3 job/hr 5 job/hr
Ответ:
1. There are 648 total combinations that can be chosen.
2. After she choses two possiblilities the total number changes to 108 total posibilities to chose from
Step-by-step explanation:
possibility: 1/2 x 1/3 x 1/2 x 1/6 x 1/9 = 648
then you remove the first two because she chose those ones
1/2 x 1/6 x 1/9 = 108 possibilities left