Patti's Pet Palace has a 90-gallon fish tank. When it needs to be cleaned, it can be drained at a rate of 4 gallons per minute. Assuming the tank was full, and x represents the number of minutes the tank has been draining, which of the following equations represents the amount of water in the tank after x minutes?

4x = 90 because for each minute the tank is drained, 4 gallons will come out of the tank.

60/4 would give you your answer

Step-by-step explanation:

your dividing minutes by gallons

  or  

step-by-step explanation:

if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or  

2/3

step-by-step explanation: