average of 10 matches is 34 , how many runs one should should score to increase his average by 4 runs .
explanation : average after 11 innings should be 38 so , required score = ( 11 * 38 ) - ( 10 * 34 ) = 418 - 340 = 78 answer : option c
subtract(multiply(add(34, 4), add(10, const_1)), multiply(10, 34))