Question

A barrel contained 50 gallons of oil. Oil leaked out of the barrel at a rate of 5 gallons every 2 days. At this rate, how many days did it take for all 50 gallons of oil to leak out of the barrel?
max
it took 10 days for all of the oil to leak out
oobleck
50 = 10*5
so it took 10*2 = 20 days to leak out

or, to convert gallons to days,
50gal * 2days/5gal = 20 days
Know it
It’s 20