Asked by rebeca

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)?
Answered by Ms. Sue
Please post your answer and we'll be glad to check it.
Answered by DrBob222
Look at dimensional analysis.
21 parts/4 hrs x ?hrs = ?parts.
Answered by rebeca
i choose a)4(21)/7
Answered by Ms. Sue
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
Answered by rebeca
d)7(4)/21
Answered by Ms. Sue
7(4)/21.

Do the math. Does the answer make sense?
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