Solve.An alcohol-and-water solution contains 20 liters of alcohol. That is 
of the total volume of the solution. Write and solve an equation to determine the total volume, V, of the solution.
A. 20 = 
V; 16 L
B. V = 
? 20; 16 L
C. 20 = 
V; 25 L
D. 20 = 
+ V; 25 L
Answer: C
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Granville and Preston are 558 miles apart. A car leaves Preston bound for Granville at 49 mph. At the same time, another car leaves Granville bound for Preston at 44 mph. How long will it take them to meet?
A. 7 hr B. 6 hr C. 3 hr D. 5 hr E. 4 hr
Provide an appropriate response.In an equation, unknown quantities are represented by 
and known quantities by 
.
A. variables, letters B. letters, numbers C. numbers, integers D. letters, variables
Solve the problem.Alan is building a garden shaped like a rectangle with a semicircle attached to one short side along its diameter. The diameter of the semicircle is equal to the width of the short side of the rectangle. If he has 60 feet of fencing to go around the garden, what dimensions will give him the maximum area in the garden?
A. width = 
? 8.4, length = 16.8
B. width = 
? 10.8, length = 16.1
C. width = 
? 16.8, length = 21.6
D. width = 
? 16.8, length = 8.4
Estimate the sum or difference by first rounding to the nearest thousand.237324707938
A. 16,000 B. 16,200 C. 15,000 D. 16,300