pushpitkc wrote:
If it is assumed that each of the n production workers in a factory assembles one instrument every t minutes, how many instruments does the factory assemble in 7.5 hours of production?
A. \(\frac{450n}{t}\)
B. \(\frac{450t}{n}\)
C. \(450nt\)
D. \(\frac{7.5tn}{60}\)
E. \(\frac{7.5n}{60t}\)
Another option is to assume values. Say 1 worker assembles 1 instrument in 30 mins (t = 30).
In 7.5 hrs, 1 worker will assemble 15 instruments.
Put n = 1 and t = 30 in options. You should get 15 from the correct answer.
Only option (A) gives you 15.
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58% (01:35) correct 
