ARITHMATIC MATHS CRASH COURSE FOR FREE AVERAGE (PART-1)

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) 45kg b)47.9 kg c) 50.1 kg d)49.9kg

The average marks of 32 boys of a class X is 60 whereas the average marks of 40 boys of class Y is 33. The average marks for both the sections combined together is? a) 44 b)45 c) 46.5 d)45.5

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Three Science classes A, B and C take a Life Science test. The average score of class A is 83. The average score of class B is 76. The average score of class C is 85. The average score of class A and B is 79 and average score of class B and C is 81. Then the average score of classes A, B and C is? a) 80 b)81 c) 80.5 d)81.5

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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 crewman ? a) 58 kg b)60kg c) 59kg d)57kg

The average weight of 15 oarsmen in a boat is increased by 1.6 kg when one of the crew, who weights 42 kg is replaced by a new man. Find the weight of the new man? a) 65 b)66 c) 43 d)67

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

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

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

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ARITHMATIC MATHS CRASH COURSE FOR FREE AVERAGE (PART-3)

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

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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)

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The mean of 20 items is 47. Later it is found that the item 62 is wrongly written as 26. Find the correct mean. a) 48.8 b)47.7 c) 49.9 d)46.6

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Abhilash Kumar

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

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Arya S

2 months ago

Thk u sir

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Aishwarya

a year ago

thanku sir for explaining this type in an easy way.

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