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

Question : 1 [SSC CGL Tier-I 2014]

A student finds the average of 10, 2 – digit numbers. If the digits of one of the numbers is interchanged, the average increases by 3.6. The difference between the digits of the 2-digit numbers is

a) 3

b) 2

c) 4

d) 5

Question : 2

In a class, the average score of girls in an examination is 73 and that of boys is 71. The average score for the whole class is 71.8. Find the percentage of girls.

a) 50%

b) 55%

c) 40%

d) 60%

Question : 3 [SSC MTS 2013]

Average weight of 25 students of a class is 50 kg. If the weight of the class teacher is included, the average is increased by 1 kg. The weight of the teacher is

a) 77 kg

b) 74 kg

c) 76 kg

d) 75 kg

Question : 4 [SSC CHSL 2010]

The average of five numbers is 7. When three new numbers are included, the average of the eight numbers becomes 8.5. The average of the three new numbers is

a) 10.5

b) 11

c) 9

d) 11.5

Question : 5 [SSC Delhi Police 2012]

The average weight of 40 children of a class is 36.2 kg. When three more children with weight 42.3 kg, 39.7 kg and 39.5 kg join the class, the average weight of the 43 children in the class is

a) 36.5 kg

b) 38.35 kg

c) 39.2 kg

d) 37.3 kg