Step-by-step explanation:
Hope it helps. Please mark as brainliest.
Consider that 100%-72%=28% represents the percentage of wrong answers. I would think as fractions as:
if 100% is the total number of answers and 28% are the wrong ones
as
if x is the total you have 14 wrong you can write:

x=(100/28)*14=50 questions
(6 & 11) bc 11-6=5 and 11+6=17
First of all, you need to simplify the expressions in order to know whether they are equal. Then, it all depends on the expression, after you simplify an expression, it will seem much easier to determine that. <span />
Answer:
75 minutes
Step-by-step explanation:
The rate at which the tank is filled up, F, and emptied, E, are respectively:

Since V is the full volume of the tank, the time required to fill the tank if both pipes are open is given by:

It will take 75 minutes to fill the tank if both pipes are open.