On a biology test, a student got 25 questions correct but did not pass. On a second attempt, the student got 30 questions correct. What was the percent of increase?
A. 20%
B. 5%
C. 80%
D. 16.7%

The answer to your question is the letter A.20%

Step-by-step explanation:

Data

Questions correct in the first attempt = 25

Questions correct in the second attempt = 30

Percent of increase = ?

Process

1.- Use proportions and cross multiplication to solve this problem. 25 questions is 100%.

                              25 questions 100%

                               30 questions x

                               x = (30 x 100)/25

                               x = 3000/25

                               x = 120 %

2.- Subtract 100 from 120%

Percent increase = 120 - 100

                             = 20%                    

answer: the answer is one of

step-by-step explanation:   we are given to write a proper fraction where the whole is divided into an even number of equal parts less than ten, and an odd number of those parts exist.

an even number less than 10 may be one of 2, 4, 6 or 8. so, the whole may be one of these four evens.

now, an odd number of these parts must exist, so the numerator must be an odd number, one of 1, 3, 5 or 7. it cannot be 9 because then the fraction will become improper.

thus, our fraction may be one of the following

c. (3,2,6) is the answer.