the average marks of a class of 26 students is 40 and that of another class of 50 students is 60 . find the average marks of all the students ?
sum of the marks for the class of 26 students = 26 * 40 = 1040 sum of the marks for the class of 50 students = 50 * 60 = 3000 sum of the marks for the class of 76 students = 1040 + 3000 = 4040 average marks of all the students = 4040 / 76 = 53.15 answer : e
divide(add(multiply(26, 40), multiply(50, 60)), add(26, 50))