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Answer:
3 gallons
Step-by-step explanation:
Let
x ----> the amount of pure acid (100% solution) in gallons
Remember that



we know that

solve for x


therefore
3 gallons of pure acid should be mixed with 3 gallons of a 20% acid solution in order to get a 60% acid solution
The answer will be a because they are similar and by law the ratio can be cubed to find ratio of volume
Answer:

Step-by-step explanation:




Answer:
A
Step-by-step explanation:
Luis because the sample is taken from the population of all seventh graders.