a batsman in his 10 th innings makes a score of 85 , and thereby increases his average by 3 . what is his average after the 10 th innings ? he had never been ’ not out ’ .
"average score before 10 th innings = 85 - 3 × 10 = 50 average score after 10 th innings = > 50 + 3 = 53 answer : b"
add(subtract(85, multiply(3, 10)), 3)