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March 3, 2015

March 3, 2015

Posted by **rebeca** on Tuesday, October 2, 2007 at 12:32pm.

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**Ms. Sue**, Tuesday, October 2, 2007 at 12:34pmPlease post your answer and we'll be glad to check it.

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**rebeca**, Tuesday, October 2, 2007 at 1:09pmi choose a)4(21)/7

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**DrBob222**, Tuesday, October 2, 2007 at 12:36pmLook at dimensional analysis.

21 parts/4 hrs x ?hrs = ?parts.

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**Ms. Sue**, Tuesday, October 2, 2007 at 1:13pmHow 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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**rebeca**, Tuesday, October 2, 2007 at 1:23pmd)7(4)/21

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**Ms. Sue**, Tuesday, October 2, 2007 at 1:27pm7(4)/21.

Do the math. Does the answer make sense?

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