Question
Average marks of 30 students is 60 and average marks of
'n' teachers is 75. If average marks of all is 66, then find the value of (n - 2).Solution
Sum of marks of all the students = 30 × 60 = 1800 Sum of marks of all the teachers = 75n (1800 + 75n) ÷ (n + 30) = 66 Or, 1800 + 75n = 66n + 1980 Or, 9n = 180 Or, 'n' = 20 Required value = 20 - 2 = 18
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