ARITHMATIC MATHS CRASH COURSE FOR FREE AVERAGE (PART-7)
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There are 50 students in a class, their average weight is 45kg. When one student leaves the class the average weight reduces by 100g. What is the weight of the students who left the class? a) 45 kg b) 47.9 kg c) 50.1 kg d) 49.9 kg
The average weight of 12 crewmen in a boat is increased by 1/3 kg, when one of the crewmen whose weight is 55 kg is replaced by a new man. What is the weight of that new man? a) 58 b) 60 c) 59 d) 57 [SSC LDC 2012]
Out of 10 teachers of a school, one teacher retires in place of him a new teacher 25 yrs. Old joins. As a result of it average age of the teachers reduces by 3 yrs. Age of the retired teacher is a) 55 kg b) 65 kg c) 45 kg d) 75 kg [SSC LDC 2015]
The average of 8 men is increased by 2 years when two of them whose age are 21 and 23 years replaced by two new men. The average age of the two new men is a) 22 yrs b) 24 yrs c) 28 yrs d) 30 yrs
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The average age of 30 boys in a class is 15 years. One boy, aged 20 years left the class but two new boys came in his place whose age differ by 5 years. If the average age of all boys now in the class becomes 15 years, the age of the younger newcomer is a) 20 b) 15 c) 10 d) 8
There are 50 students in a class. One of them weighting 50 kg goes away and a new student joins. By this the average weight of the class increases by 1/2 kg. The weight of the new students is a) 70 kg b) 72 kg c) 76 kg d) 75 kg
The average age of 11 platers of a cricket team is increased by 2 months when two of them aged 18 years and 20 years are replaced by two new players. The average age of the new player is a) 19 year 1 month b) 19 year 6 month c) 19 year 11 month d) 19 year 5 month.
There were 24 students in a class. One of them, who was 18 years old, left the class and his place was filled by a newcomer. If the average of the class thereby, was lowered by one month, the age of the newcomer is a) 14 years b) 15 years c) 16 years d) 17 years
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