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Qalter working 4 hours, frank has made 21 machine parts

alter working 4 hours, frank has made 21 machine parts.at the same rate how many parts can he make in 7 hours? 4(21)/7,7(21),7(21)/4,7(4)/21,7(4)(21)?
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6 answers.
#1MaximiliaAnswered at 2013-01-10 03:52:07
i choose a)4(21)/7
#2woodyAnswered at 2013-01-25 12:21:37
Please post your answer and we'll be glad to check it.
#3BashAnswered at 2013-01-30 17:45:52
7(4)/21.

Do the math. Does the answer make sense?
#4Lawrence J. DiggsAnswered at 2013-02-05 13:38:21
Look at dimensional analysis.
21 parts/4 hrs x ?hrs = ?parts.
#5tosinAnswered at 2013-02-07 11:03:44
d)7(4)/21
#6NakiyaAnswered at 2013-02-09 04:21:02
How can a) be the right answer? 4(21)/7 = 12. The problem has stated that he made 21 parts in 4 hours. How can he make fewer parts in more hours?

Please try again.

Hint: you could set up a proportion:
4 is to 21 as 7 is to x
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