Study the following table and answer the question:-

Numbers of students appeared (A) and passed (P) in an annual examination from four schools P, Q, R and S in five years (2014 to 2018).

The ratio between the average of no. of students appeared from school S in 2014 to 2017 and the no. of students appeared from school R in 2014 is:

61 : 84

Total no. of students appeared from S in 2014 to 2017 = 250 + 300 + 320 + 350 = 1220

Avg. = \(\frac{1220}{4}\) = 305

no. of students appeared from R in 2014 is = 420

Req. Ratio ⇒ 305 : 420 ⇒ 61 : 84