ARITHMATIC MATHS CRASH COURSE FOR FREE AVERAGE (PART-5)

The average age of a husband and a wife was 27 years when the child was born, the average age of the husband, the wife and a new-born child is 21 year now. What is the present age of the child? a) 1 years b)2 years c) 3 years d)4 years

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The average marks obtained by 40 students of a class is 86. If the 5 highest marks are removed, the average reduces by one mark. The average marks of the top 5 students is a) 92 b)96 c) 93 d) 97

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In an examination average marks obtained by the girls of a class is 85 and the average marks obtained by the boys of the same class is 87. If the girls and boys are in the ratio 4:5, average of the whole class (approx.) is close to a) 86.5 b)86.4 c) 85.9 d)86.1

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The average weight of the first 11 persons among 12 persons is 95 kg. The weight of 12th person is 33 kg more than the average weight of all the 12 persons. The weight of the 12th person is a) 128.75 b) 131 c) 128 d)97.45

In a family, the average age of a father and a mother is 35 years. The average age of the father, mother and their only son is 27 years. What is the age of the son? a) 12 years b)11 years c) 10.5 years d) 10 years

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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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Abhudya singh

7 months ago

great sir great pranam aapko

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Prabhu Dayal

7 months ago

सराहना के लिए धन्यवाद

Prabhu Dayal

7 months ago

प्रणाम

A

Aishwarya

a year ago

Doubt:- sir last second question me answer 131 hona chahiye.
let d avg of all 12 be x
{(11×95)+ x+33}÷12 = x
on solving this we get x= 98 on adding 33 we get 12th observation 131.
sir plz check it n reply it's correct or not

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Abhilash Kumar

a year ago

ans is correct
12th observation is more 33 than avg of 12 observation
sabko equal le aao
33 extra milega
12th observation ki value
95 + 33 = 128 hoga

Abhilash Kumar

a year ago

ok

A

Aishwarya

a year ago

doubt:- sir last question me pehle wale question ki tarah 11yrs ko 3 se divide kyun ni kiya??

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Abhilash Kumar

a year ago

total par value nikali gayi hai na

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Aishwarya

a year ago

ok sir got it. thanku sir.

Suresh Gain

a year ago

Very nice sir aise hi sare topics kara dijiye

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