Posted by rebeca on Tuesday, October 2, 2007 at 12:32pm.
Please post your answer and we'll be glad to check it.
i choose a)4(21)/7
Look at dimensional analysis.
21 parts/4 hrs x ?hrs = ?parts.
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
d)7(4)/21
7(4)/21.
Do the math. Does the answer make sense?
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