a batsman in his 15 th innings makes a score of 85 , and thereby increases his average by 3 . what is his average after the 15 th innings ? he had never been ’ not out ’ .
"average score before 15 th innings = 85 - 3 × 15 = 40 average score after 15 th innings = > 40 + 3 = 43 answer : d"
add(subtract(85, multiply(3, 15)), 3)