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Todays' Thought

All achievements, all earned riches, have their beginning in an idea.

- Napoleon Hill

हर एक कामयाबी और दौलत की शुरआत एक विचार से होती है |

- नेपोलियन हिल

Quantitative Aptitude : Average Question & Answer in English (Level-1)

Level-1 Ques. in

Hindi

English

6.	The average of 3, 5, 6 & X is 6 and the average of 4, 7, 9, X and Y is 7. What is the value of Y?

	A. 4	B. 5
	C. 3	D. 6
	View Answer Solution Report Error
	Answer & Solution Hide Solution Box Answer : B Solution : Answer : Option (B) Solution : We have, (3+5+6+X)/4 = 6 or 14 + X = 24 or X = 10 also (4+7+9+X+Y)/5=7 or 30 + Y = 35 or y = 5 So, the value of Y = 5 Report error Hide Error Report Box

7.	If the average of 4 observations a, a+4, a+5 and a+7 is 8, then what will be the average of last two observations?

	A. 8	B. 10
	C. 12	D. 15
	View Answer Solution Report Error
	Answer & Solution Hide Solution Box Answer : B Solution : Answer : Option (B) Solution : We have, {a + (a+4) + (a+5) + (a+7)}/4 = 8 4a + 16 = 32 or 4a = 16 or a = 4 So, the numbers are 4, 8, 9 & 11 Then average = (11+9)/2 = 10 Report error Hide Error Report Box

8.	The average age of a class of 39 students is 15 years. If the age of the teacher be included, then the average increases by 3 months. Find the age of the teacher.

	A. 20 years	B. 22 years
	C. 25 years	D. 30 years
	View Answer Solution Report Error
	Answer & Solution Hide Solution Box Answer : C Solution : Answer : Option (C) Solution : Total age of 39 students = (39x15) years = 585 years Average age of 40 persons = 15 years 3 months = 61/4 years Total age of of 40 persons = (61/4) x 40 years = 610 years So, age of the teacher = 610 - 585 years = 25 years Report error Hide Error Report Box

9.	A batsman makes a score of 87 runs in the 17th inning and thus increases his average by 3. Find his average after 17th inning.

	A. 35	B. 38
	C. 39	D. 40
	View Answer Solution Report Error
	Answer & Solution Hide Solution Box Answer : C Solution : Answer : Option (C) Solution : Let the average after 17th inning = X Then, average after 16th inning = X-3 So, 16(X-3) + 87 = 17X 16X - 48 + 87 = 17X X = 39 Report error Hide Error Report Box

10.	The average weight of A, B & C is 45 Kg. If the average weight of A and B be 40 Kg and that of B & C be 43 Kg than the weight of B is :

	A. 17 Kg	B. 20 Kg
	C. 26 Kg	D. 31 Kg
	View Answer Solution Report Error
	Answer & Solution Hide Solution Box Answer : D Solution : Answer : Option (D) Solution : Let A, B & C represent their respective weights, then we have A+B+C = 45 x 3 = 135 ...............(i) A+B = 40 x 2 = 80 ...............(ii) B+C = 43 x 2 = 86 ...............(iii) Adding equation (ii) & (iii) , we get A+2B+C = 166 ...............(iv) Subtracting equation (i) from equation (iv), we get B = 31, So, B's weight = 31 Kg. Report error Hide Error Report Box

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