So I’m going off of what I’m given here; All 10 calves with Corid powder, 20% aprolium, daily for 10 days, 3 oz + 1 qt water. - - Now we have to use some math to correctly measure out the dosage. 10 - 100lb calves = 10 oz of solution. Now we have to figure out how much Corid powder and water is in 10 oz of solution. Well we know that to make to make an ounce of solution, it would take 3 oz of Corid powder and 1 qt of water. A quart of water equals 32 fluid ounces. The powder does take up space in the water, but not enough to actually be needed to added to the measurement. So basically we go off of the amount of water. Acquiring 10 doses of solution requires 10 ounces of water. My final answer is 10 ounces of solution. I hope I was correct, but if not my sincere apologies. Good luck !