Solve the problem.In a chemistry class, 3 liters of a 4%-saline solution must be mixed with a 10% solution to get a 6% solution. How many liters of the 10% solution are needed?
A. 1.5 L
B. 2.5 L
C. 3.0 L
D. 0.5 L
Answer: A
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Solve the variation problem.The amount of time it takes a swimmer to swim a race is inversely proportional to the average speed of the swimmer. A swimmer finishes a race in 30 seconds with an average speed of 5 feet per second. Find the average speed of the swimmer if it takes 37.5 seconds to finish the race.
A. 3 feet per second B. 6 feet per second C. 5 feet per second D. 4 feet per second
Solve the problem.The Tasmanian House of Representatives has 435 members (235 Demublicans and 200 Republicrats). A set of 3 leaders - a Speaker, a Whip, and a Secretary - must be selected. How many different sets of leaders can be selected if the leaders cannot all be of the same political party?
A. 
B. 
+ 
C. 
- 
- 
D. 4353 - 2353 - 2003
E. none of these
Convert. When necessary, round the answer to two decimal places.124 ounces = _____ pounds
A. 7.75 B. 1984 C. 1736 D. 1
Find the probability.A spinner has equal regions numbered 1 through 21. What is the probability that the spinner will stop on an even number or a multiple of 3?
A. 
B. 17
C. 
D. 