Given: A batsman scores 0 run in his 19th innings due to this his average is decreased by 5 runs Concept: When no runs scored in 19th innings, total runs decreases. And therefore Average also decreases Calculation: Let x be the average in 18thinnings ⇒ Total runs in 18 innings = 18x ∵ 0 run scored in 19th innings, total runs in 19 innings =18x+0=18x Given that average decreases by 5 runs ∴ Average in 19th innings, 18
x
19
=x−5 ⇒ 18x=19x−(19×5) ∴ x=95 Average run in his 18th innings = 95