6/21 I think cause you can't go down any more
The answer is B because facts
23 regular coffees were served.
25% means 1/4
25% x 92 = 23 regular coffees were served.
92 - 23 = 69 decaf coffees were served.
A pint is 16 ounces. So 3 pints are 48 ounxes. $4.80 divided by 48 is 0.1. So each ounce is 10 cents
The time it takes him to swim some laps is proportional to the number of laps ... for a while, as long as he keeps up the same speed. But later, as he wears out and begins to swim slower and slower until finally he slips beneath the waves and sinks like a rock, the direct proportionality breaks down.
That's what I would expect. Other reasonable people may disagree.