model 6 find average of excluded number Practice Questions Answers Test with Solutions & More Shortcuts

Question : 6 [SSC CPO 2010]

There are 50 students in a class. Their average weight is 45 kg. When one student leaves the class the average weight reduces by 100g. What is the weight of the student who left the class ?

a) 47.9 kg

b) 49.9 kg

c) 45 kg

d) 50.1 kg

Question : 7

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).

a) 57 kg

b) 66 kg

c) 55 kg

d) 56 kg

Question : 8 [SSC FCI Assistant 2012]

The average of five numbers is 140. If one number is excluded, the average of the remaining four numbers is 130. The excluded number is :

a) 134

b) 180

c) 135

d) 150

Question : 9 [SSC CGL Prelim 2005]

The average of marks of 28 students in Mathematics was 50; 8 students left the school, then this average increased by 5. What is the average of marks obtained by the students who left the school ?

a) 37.5

b) 42.5

c) 50.5

d) 45

Question : 10 [SSC CHSL 2011]

The average of six numbers is 32. If each of the first three numbers is increased by 2 and each of the remaining three numbers is decreased by 4, then the new average is

a) 34

b) 31

c) 35

d) 30