Answer:
0.43 gallons
Step-by-step explanation:
172 inches is is 14.33 feet
assuming the wall is a parallelogram to find the area you times the two sides 6x14.33
that would equal 86
once you have that you must find out how much 86 is out of 200
do this by dividing one number with the other and then multiply the result by 100.
that being 0.43
