8+7+2= 17 total
First blue chip chance = 8/17
Second blue chip chance = 7/16 as it’s without replacement so the total decreases by 1.
Green chip= 7/15 as again without replacement the total has been reduced by 2
The volume of a cylinder is pi*height*radius^2 = pi*5*(14/2)^2 = 769.69 ft^3. To get the total gallons multiply 769.69 ft^3 by 7.5gal/ft^3 to get 5772.6765 gallons or 5773 gallons rounded to nearest whole number.
If the 316 is supposed to be 3/16 and the 34 is supposed to be 3/4, then your answer is 2.