ARITHMATIC MATHS CRASH COURSE FOR FREE AVERAGE (PART-2)

Out of 10 teachers of a school, one teacher retires and in placed of him a new teacher 25 yrs came. As a result of it average age of the teachers reduces by 3yrs. Age of the retired teacher is a) 55 b) 65 c) 75 d)45

= 30%

The average age of 8 persons is increased by 2 years, when one of them, whose age is 24 years is replaced by a new person. The age of the new person is a) 42 years b) 40 years c) 45 year:s d)38 years

The average age 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 years b)24 years c) 30 year:s d)28 years

Average weight of 25 persons is increased by 1 kg when one man weighting 60 kg is replaced by a new person. Weight of new person is a) 50 kg b)61 kg c) 86 kg d)85 kg

The average age of 11 players 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 players is a) 19 years 1 month b)19 years 6 month c) 19 years 11 montlh d)19 years 5 month

38 st

THANKS FOR WATCHING RATE LIKE unacademy ENROLL/SAVE FOLLOW

If the average weight of 6 students is 50 kg. If two student of average age of 51 kg added and other students of average age of 55 kg also added then the average weight of all students is a) 51.5 kg b) 61 kg c) 51.2kg d)52 kg

The average marks of 100 students were found to be 40. Later on it was discovered that a score of 53 was misread as 83. Find the correct average corresponding to the correct score. a) 39 kg b) 41 kg c) 38.7 kg d)39.7 kg

The average of 18 observations is recorded as 124. Later it was found that two observations with values 64 and 28 were entered wrongly as 46 and 82. Find the correct average of the 18 observations. a) 122 b) 123 c) 111(7/9) d)137(3/9)

Activate Windows

be divided .irdo

THANKS FOR WATCHING RATE LIKE unacademy ENROLL/SAVE FOLLOW

15 lessons,

3h 19m

Enroll

129

✕Download

Abhilash Kumar

Online Educator Cleared SSC CGL, RRB & UGC NET.
Teaching from 4 years in many recognize institutes of Kanpur.

U

Unacademy user

Santosh Kushwaha

a year ago

Helpful

1

Reply

Kishoree Bhadauriya

a year ago

Thanks. Do share and make support for us😊👍

A

Aishwarya

a year ago

sir very helpful video

0

Reply

A

Aishwarya

a year ago

sir very helpful video

0

Reply