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- Question
- Average of a,b and c is 11, average of c,d and e is 17 average of e and f is 22 and the average of e and c is 17 . Find out the average of a, b, c, d, e and f.
Options- A. 151?3
- B. 162?3
- C. 171?2
- D. 152?3
- Correct Answer
- 152?3
Explanationa + b + c = 11 x 3 = 33 .....(i)
c + d + e = 17 x 3 = 51 .....(ii)
e + f = 22 x 2 = 44 .....(iii)
e + c = 17 x 2 = 34 .....(iv)
From Eqs. (ii) and (iv), we get
34 + d = 51
? d = 17
Now adding Eqs. (i), (ii), (v), we get
a + b + c + d + e + f = 33 + 44 + 17 = 94
? Average of a, b, c, d, e and f = 94/6 = 152?3 - 1. A city has a population of 300000 out of which 180000 are males. 50% of the population is literate. If 70% of the males are literate, the number of literate females is
Options- A. 24000
- B. 30000
- C. 54000
- D. 60000 Discuss
- 2. On deceasing the price of T.V. set by 30%. Its sale in increased by 20%. What is the effect on the revenue received by the shopkeeper?
Options- A. 10% increased
- B. 10% decreased
- C. 16% increased
- D. 16% decrease Discuss
- 3. In order to pass in an exam, a students is required to get 780 marks out of the aggregate marks. Sonu got 728 marks and was declared failed by 5%. What are the maximum aggregate marks a student can get in the examination?
Options- A. 1040
- B. 1100
- C. 1000
- D. Cannot be determined Discuss
- 4. A man donated 5% of his income to a charitable organisation and deposited 20% of the remainder in a bank. If he now has Rs. 1919 left, what is his income?
Options- A. Rs. 2558.60
- B. Rs. 2525
- C. Rs. 2500
- D. Rs. 2300 Discuss
- 5. A number decreased to 72 1/ 2% gives 87. The number is?
Options- A. 58
- B. 110
- C. 120
- D. 135 Discuss
- 6. Two numbers are less than a third number by 30%and 37% respectively. How much percent is the second number less than the first?
Options- A. 3%
- B. 4%
- C. 7%
- D. 10% Discuss
- 7. The price of sugar is increased by 20%. If the expenditure is not allowed to increased. Then ratio between the reduction in consumption and the original consumption?
Options- A. 1 : 3
- B. 1 : 4
- C. 1 : 6
- D. 1 : 5 Discuss
- 8. Water tax is increased by 20% but its consumption is decreased by 20%. Then the increase or decrease in the expenditure of the money is?
Options- A. No change
- B. 5% decrease
- C. 4% increased
- D. 4% decreased Discuss
- 9. 3 litres of water is added to 15 litres of a mixture of a 20% solution of alcohol in water. The strength of alcohol is now?
Options- A. 121/2%
- B. 162/3%
- C. 24%
- D. 16% Discuss
- 10. The value of a machine depreciates 10% annually. If its present value is Rs. 4000. Its value 2 years later will be?
Options- A. Rs. 3200
- B. Rs. 3240
- C. Rs. 3260
- D. Rs. 3280 Discuss
More questions
Correct Answer: 24000
Explanation:
Total population = 300000
Total number of males = 180000
Total Literates = 50% of total population = 150000
Number of literate males = 70% of males = 126000
? Number of literate females = 150000 - 126000 = 24000
Correct Answer: 16% decrease
Explanation:
Let price = Rs. 100, sale = 100
Then sale value = Rs. (100 x 100) = Rs. 10000
New sale value = Rs. (70 x 120) = Rs. 8400
Decrease% = (1600/10000) x 100 % = 16%
Correct Answer: 1040
Explanation:
Let the maximum marks be N .
According to the question,
Then, 780 - 728 = 5% of N
? 52 = 5% of N
? N = 5200/5 = 1040
Correct Answer: Rs. 2525
Explanation:
Let his income be Rs. N, then N - 5% of N - 20% of 95% of N = 1919
? N - N/20 - (20 x 95 x N)/(100 x 100) = 1919
? N - N/20 - 19N/100 = 1919
? 100N - 5N - 9N = 191900
? N = 191900 / 76 = 2525
Correct Answer: 120
Explanation:
? 721/2% of N = 87
? {(145/2) x N} / 100 = 87
? N = (87 x 2 x 100) / 145 = 120
Correct Answer: 10%
Explanation:
Let third number be N
Then, first number = 70% of N = 7N/10 and,
Second number = 63% of N = 63N/100
Difference = 7N/10 - 63N/100 = 7N/100
? Required percentage = (7N/100) x (10/7N) x 100 % = 10%
Correct Answer: 1 : 6
Explanation:
Reduction in consumption = (20/120) x 100% = 50/3%
? Reduction in consumption /Original consumption = (50/3) / 100 = 1/6 = 1 : 6
Correct Answer: 4% decreased
Explanation:
Let tax = Rs. 100 and Consumption = 100 units
Original expenditure = Rs. (100 x 100) = 10000
New expenditure = Rs. (120 x 80) = Rs. 9600
? Decreased in expenditure = (400 x 100)/1000 % = 4%
Correct Answer: 162/3%
Explanation:
Alcohol in 15 litres =(20 x 15)/100 litres = 3 litres
Now, alcohol in 18 litres = 3 litres
? strength of alcohal =(3/18) x 100 % = 162/3%
Correct Answer: Rs. 3240
Explanation:
Value of machine 2 years later = Rs. [ 4000 x {(1 - 10)/10)}2]
= Rs. (4000 x 9/10 x 9/10)
= Rs. 3240
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