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Mariko can knit 5 rows of a scarf in x minutes. If there are
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31 May 2017, 07:16
31 May 2017, 07:16
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Question Stats:
72% (02:10) correct
27% (02:39) wrong based on 47 sessions
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Mariko can knit 5 rows of a scarf in x minutes. If there are 100 rows in each foot of the scarf, how many hours, in terms of x and y, will it take Mariko to finish a scarf that is y feet long?
A. \(\frac{xy}{3}\)
B. \(\frac{1200}{xy}\)
C. \(1200xy\)
D. \(\frac{3}{xy}\)
E. \(3xy\)
A. \(\frac{xy}{3}\)
B. \(\frac{1200}{xy}\)
C. \(1200xy\)
D. \(\frac{3}{xy}\)
E. \(3xy\)
Drill 2
Question: 11
Page: 342
Question: 11
Page: 342
Re: Mariko can knit 5 rows of a scarf in x minutes. If there are
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02 Jul 2017, 14:53
02 Jul 2017, 14:53
1
Expert Reply
Explanation
As soon as you see variables in the answer choices, set up your scratch paper to Plug In.
Start with x = 5, so it takes 1 minute to knit 1 row. Now make y = 2. A scarf 2 feet long means Mariko has to knit 200 rows, which will take 200 minutes; since the problem asks how many hours it will take, your target answer is \(\frac{200}{60}=3\frac{1}{3}\).
Now plug your values into the answer choices; only choice (A) hits your target. Choices (C) and (E) are clearly too small, and choice (D) is a fraction, so you may not have to calculate all the choices.
Hence option A is correct!
As soon as you see variables in the answer choices, set up your scratch paper to Plug In.
Start with x = 5, so it takes 1 minute to knit 1 row. Now make y = 2. A scarf 2 feet long means Mariko has to knit 200 rows, which will take 200 minutes; since the problem asks how many hours it will take, your target answer is \(\frac{200}{60}=3\frac{1}{3}\).
Now plug your values into the answer choices; only choice (A) hits your target. Choices (C) and (E) are clearly too small, and choice (D) is a fraction, so you may not have to calculate all the choices.
Hence option A is correct!
Re: Mariko can knit 5 rows of a scarf in x minutes. If there are
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16 Sep 2017, 23:33
16 Sep 2017, 23:33
Is it a typo the fact that there is a z instead of y?
