Answer:
4 times
Step-by-step explanation:
1 quart is equivalent to 32 fluid ounces.
If each eruption consumes 8 fluid ounces of vinegar. Assuming that the amount of vinegar required per eruption is constant, the number of times Tanvi can make her volcano erupt is:

Tanvi can make her volcano erupt 4 times with 1 quart of vinegar.
The answer is in the picture provided below. :)
9-4=5
5(2p-1)=41
10p-5=41
41+5=46
10p=46
46/10=4.6
p=4.6