The total number of questions that are on the test is equal to 60 questions.
In Mathematics, a percentage is any number that is expressed as a fraction of hundred (100).
Let the variable T represent the total number of questions.
In order to determine the number or quantity which represents the total number of questions, we would apply the following mathematical equation (formula);
Quantity = percent × total number of questions
24 = 40/100 × T
2400 = 40T
T = 2400/40
T = 60 questions.