**Problem 1:**
A duct from a furnace forks into two ducts. The air coming into the two ducts was 2,800 cubic feet per minute. If one duct took 400 cubic feet per minute more than the other duct, what was the flow in cubic feet per minute (cu ft/min) in each duct?

a. The flow is 1,900 cu ft/min in the first duct, the flow is 900 cu ft/min in the second duct.
b. The flow is 1,550 cu ft/min in the first duct, the flow is 1,250 cu ft/min in the second duct.
c. The flow is 1,700 cu ft/min in the first duct, the flow is 1,100 cu ft/min in the second duct.
d. The flow is 1,100 cu ft/min in the first duct, the flow is 1,900 cu ft/min in the second duct.
e. The flow is 1,600 cu ft/min in the first duct, the flow is 1,200 cu ft/min in the second duct.

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**Problem 2:**
A dairyman wants to make 237 lb of 14%-butterfat cream. How many pounds of 40%-butterfat cream and how many pounds of 1%-butterfat milk must he mix?

a. 82 lb of 40%-butterfat cream, 155 lb of 1%-butterfat milk.
b. 74 lb of 40%-butterfat cream, 163 lb of 1%-butterfat milk.
c. 158 lb of 40%-butterfat cream, 79 lb of 1%-butterfat milk.
d. 79 lb of 40%-butterfat cream, 158 lb of 1%-butterfat milk.
e. 81 lb of 40%-butterfat cream, 156 lb of 1%-butterfat milk.