# If I sand 66 drywall corners in 30 mins, how long did it take to sand one corner?

Please helppppp, I need an average.

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- RRLv 78 months ago
1 corner will be 1/66 of 30 minutes

30/1 x 1/66 = 30/66

30/66 = 10/33 minutes

= 0.455 minute

0.455 x 60 = 27.3 seconds

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- Mr. SmartypantsLv 78 months ago
If you did 30 in 66 minutes, you do one in 30/66 minutes. That's 0.455 minutes (rounded to 3 places).

Now we don't usually say 0.455 minutes. So you can convert that into seconds by multiplying it by 60. 0.455*60 = 27.24 seconds.

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