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You left yogurt out for 2 hours is it okay?
Yes
If I work 12 hours and has already worked 4 what fraction of my shift is left?
If you worked 4 out of 12 hours, then 8 out of 12 hours are left or 8/12 of the shift which is the same as 2/3 of the shift.
The half-life of gallium-67 is 78.2 hours If you begin with 87.6 milligrams of gallium-67 how many milligrams will you have left after 312.8 hours have passed?
If you do the division - 312.8 hours / 78.2 hours - you see that 312.8 hours is 4 times the half-life. So, you simply divide the original amount by 2, repeating 4 times: 87.6 / 2 / 2 / 2 / 2.
How do you take 1 hour and 39 minutes from 3 hours and 27 minutes?
Well if you take the hour away you are left with 2 hours and 27 minutes then if you take away 27 minutes you are left with 2 hours and you still need to take away 12 minutes so the answer is 1 hour and 48 minutes.
How many days hours and minutes are in 4015 minutes?
Ok, let's do this. There are (24X60) = 1,440 minutes in one day. So, if we divide 4,015 by 1,440 we get 2 days with 1,135 minutes left over. Take this 1,135 and divide by 60 to get hours. We get 18 hours with 55 minutes left. Therefore 4,015 minutes equals 2 days, 18 hours, and 55 minutes.
