Question: the average marks of a class of 24 students is 40 and that of another class of 50 students is 60 . find the average marks of all the students ?
A) 52.2
B) 59.5
C) 52.8
D) 53.5
E) 52.1
Correct answer: d
Grade: 7 | Topic: Expressions and Equations | Difficulty: Medium | Standard: 7.EE.B.3