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chalowiee1570
18.06.2020 •
Mathematics
Mary can make a costume twice as fast as Sam can. If they both work together, they can make it in 6 hours. How long will it take Mary to make the costume if she works alone?
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Ответ:
9 hours
Step-by-step explanation:
Assume the following :
Sam's rate = y for the costume
Mary is twice as fast as Sam; therefore,
Mary's rate = 2y for the costume
If Sam and Mary both work together, it will take them 6hours to make the costume.
Their rate = 1/6
That is,
y + 2y = 1/6
3y = 1/6
18y = 1
y = 1/18 ; taking reciprocal to get time taken = 18 hours
2y = 2/18
2y = 1/9 (9 hours (reciprocal)) timetaken by Mary.
Time taken by Sam = 18 hours
Time taken by Mary = 9 hours
Ответ:
9 cards high two cards out he would have 6 extra green cards