Problem: the average runs of a cricket player of 10 innings was 20 . how many runs must he make in his next innings so as to increase his average of runs by 4 ?
Rationale: "explanation : average after 11 innings = 24 required number of runs = ( 24 * 11 ) – ( 20 * 10 ) = 264 – 200 = 64 answer : c"
annotated_formula: subtract(multiply(add(10, const_1), add(20, 4)), multiply(20, 10))