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If in school D, the number of students who appeared for the exams in 1999-2000 is 20% more than that in the previous year and the number of students who passed in 1999-2000 is also 20% more than that in the previous year, then what is the ratio of the number of students who failed in 1998-1999 to that in 1999-2000?

A.	5:6	B.	5:7
C.	7:6	D.	4:3
E.	3:5

Answer and Explanation

Answer:5:6

Explanation:
let us assume that the total number of students in school D in
=> 1998 – 1999 = 100
=> In 1999-2000 it is 120
=> Now given, number of students who failed in 1999-2000
=> 70 x 120 / 100 = 84
=> Number of students who failed in 1998-2000
=> 100 x 84/120 = 70
=> Required ratio = 70/84 = 5:6

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