Christian randomly selects students from his grade to rate a math test as easy, moderate, or difficult. Of the students he surveyed, 13 said the test was easy, 11 rated it as moderate, and 3 found it difficult. Assuming that all students took the same test, how many of the 162 total students in Christian’s grade would probably rate the test something other than easy?
A.
27
B.
78
C.
84
D.
126

Question

Christian randomly selects students from his grade to rate a math test as easy, moderate, or difficult. Of the students he surveyed, 13 said the test was easy, 11 rated it as moderate, and 3 found it difficult. Assuming that all students took the same test, how many of the 162 total students in Christian’s grade would probably rate the test something other than easy?
A. 
27
B. 
78
C. 
84
D. 
126

AP · Answer

So Christian surveyed a total of 27 students, of which 13 students stated was easy and 14 (moderate + difficult) students said that the test was 'something other than easy'.
$$\frac{ 14 }{ 27 }=\frac{ x }{ 162 }$$
Solve for x.