Q.176- The mean weight of 34 students of a school is 42 kg. If the weight of the teacher be included, the mean rises by 400 grams. Find the weight of the teacher (in kg.)
Q.177- Five years ago, the average age of P and Q was 25. The average age of P, Q and R today is 25. Age of R after 5 years will be :
Q.178- Fifteen movie theatres average 600 customers per theatre day. If six of the theatres close down but the total theatre attendance stays the same , then the average daily attendance per the remaining theatres is.
Q.179- If the mean of 4 observations is 20, when a constant ‘c’ is added to each observation, the mean becomes 22. The value of c is :
Q.180- The average age of 30 students is 9 years. If the age of their teacher is included, the average age becomes 10 years. The age of the teacher (in years) is :

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