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- Question
The mean of marks secured by 45 students in division A of class X is 56, 40 students of division B is 52 and that of 40 students of division C is 50. Find the mean of marks of the students of three divisions of Class X.
Options- A. 52.1
- B. 51.4
- C. 52.8
- D. 54.2
- Correct Answer
- 52.8
- 1. A factory buys 10 machines. 1 MachineA, 4 MachineB and rest MachineC. Prices of the machines are Rs 90000, Rs 40000 and Rs 40000 respectively. Calculate the average cost of these machines?
Options- A. 56666.6
- B. 68333.3
- C. 45000
- D. 43500 Discuss
- 2. The average marks of 45 students is shown as 65. It includes a wrong entry of 84 marks instead of 48 marks. The correct average is:
Options- A. 65.8 marks
- B. 67.4 marks
- C. 62.6 marks
- D. 64.2 marks Discuss
- 3. The average of 19 consecutive even integers is 50. The highest of these integers is
Options- A. 88
- B. 68
- C. 126
- D. 100 Discuss
- 4. In a class of 55 students there are 34 girls. The average weight of these girls is 51 Kg and average weight of the full class is 55.2 kgs. What is the average weight of the boys of the class?
Options- A. 62
- B. 59.4
- C. 56.8
- D. 60 Discuss
- 5. The average revenues of 13 consecutive years of a company is Rs 78 lakhs. If the average of first 7 years is Rs 73 lakhs and that of last 7 years is Rs 85 lakhs, what is the revenue for the 7th year?
Options- A. Rs 94 lakhs
- B. Rs 90 lakhs
- C. Rs 88 lakhs
- D. Rs 92 lakhs Discuss
- 6. The bankers gain of a certain sum due 2 years hence at 10% per annum is Rs 24 .The percent worth is
Options- A. 400
- B. 800
- C. 500
- D. 600 Discuss
- 7. The banker's discount on a certain sum due 2 years hence is11/10of the true discount. The rate percent is:
Options- A. 10%
- B. 7%
- C. 8%
- D. 5% Discuss
- 8. The banker's discount on Rs. 1650 due a certain time hence is Rs. 165. Find the true discount and the banker's gain.
Options- A. 15
- B. 20
- C. 18
- D. 13 Discuss
- 9. The true discount on a bill of Rs. 540 is Rs. 90. The banker's discount is:
Options- A. 108
- B. 115
- C. 100
- D. 120 Discuss
- 10. If the true discount on a certain sum due 6 months hence at 15% is Rs. 120, what is the banker's discount on the same sum for the same time and at the same rate?
Options- A. 50
- B. 129
- C. 100
- D. 160 Discuss
Average problems
Search Results
Correct Answer: 45000
Correct Answer: 64.2 marks
Correct Answer: 68
Correct Answer: 62
Correct Answer: Rs 92 lakhs
Correct Answer: 600
Explanation:
T.D = (B.G * 100) / (Rate * Time)
(24*100) / (10 * 2)
= 120.
P.W = (100 *T.D) / (Rate * Time)
= (100 * 120) /(10 * 2)
= 600
Correct Answer: 5%
Explanation:
Let T.D. be Re. 1.
Then, B.D. = Rs.11/10= Rs. 1.10.
Sum = Rs. (1.10*1)/(1.10-1) = Rs. (110/10)= Rs. 11.
S.I. on Rs. 11 for 2 years is Rs. 1.10
Rate = [(100 x 1.10)/(11 x 2 )]% = 5%.
Correct Answer: 15
Explanation:
Sum = [(B.D.xT.D.)/ (B.D.-T.D.)]
= [(B.D.xT.D.)/B.G.]
T.D./B.G. = Sum/ B.D.
=1650/165
=10
Thus, if B.G. is Re 1, T.D. = Rs. 10.
If B.D.is Rs. ll, T.D.=Rs. 10.
If B.D. is Rs. 165, T.D. = Rs. [(10/11)xl65]
=Rs.150
And, B.G. = Rs. (165 - 150) = Rs, 15.
Correct Answer: 108
Explanation:
P.W. = Rs. (540 - 90) = Rs. 450.
S.I. on Rs. 450 = Rs. 90.
S.I. on Rs. 540 = Rs.( 90 /450)x 540 = Rs. 108.
B.D. = Rs. 108.
Correct Answer: 129
Explanation:
B.G. = S.I. on T.D.
= Rs.(120 x 15 x 1/2 x 1/100)
= Rs. 9.
(B.D.) - (T.D.) = Rs. 9.
B.D. = Rs. (120 + 9) = Rs. 129.
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