GMAT-Quantitative Aptitude
GMAT-Quantitative Aptitude
21. When a student weighing 45 kgs left a class, the average weight of the remaining 59 students increased by 200g. What is the average weight of theremaining 59 students?
- 57 kgs
- 56.8 kgs
- 58.2 kgs
- 52.2 kgs
22. Three math classes: X, Y, and Z, take an algebra test.
The average score in class X is 83.
The average score in class Y is 76.
The average score in class Z is 85.
The average score of all students in classes X and Y together is 79.
The average score of all students in classes Y and Z together is 81.
What is the average for all the three classes?
The average score in class X is 83.
The average score in class Y is 76.
The average score in class Z is 85.
The average score of all students in classes X and Y together is 79.
The average score of all students in classes Y and Z together is 81.
What is the average for all the three classes?
- 81
- 81.5
- 82
- 84.5
23. The average weight of a class of 24 students is 36 years. When the weight of the teacher is also included, the average weight increases by 1kg. What is the weight of the teacher?
- 60 kgs
- 61 kgs
- 37 kgs
- None of these
24. The average of 5 quantities is 10 and the average of 3 of them is 9. What is the average of the remaining 2?
- 11
- 12
- 11.5
- 12.5
25. The average age of a family of 5 members is 20 years. If the age of the youngest member be 10 years then what was the average age of the family at the time of the birth of the youngest member?
- 13.5
- 14
- 15
- 12.5
26. A student finds the average of 10 positive integers. Each integer contains two digits. By mistake, the boy interchanges the digits of one number say ba for ab. Due to this, the average becomes 1.8 less than the previous one. What was the difference of the two digits a and b?
- 8
- 6
- 2
- 4
27. Average cost of 5 apples and 4 mangoes is Rs. 36. The average cost of 7 apples and 8 mangoes is Rs. 48. Find the total cost of 24 apples and 24 mangoes.
- 1044
- 2088
- 720
- 324
28. A father left a will of Rs.35 lakhs between his two daughters aged 8.5 and 16 such that they may get equal amounts when each of them reach the age of 21 years. The original amount of Rs.35 lakhs has been instructed to be invested at 10% p.a. simple interest. How much did the elder daughterget at the time of the will?
- Rs. 17.5 lakhs
- Rs. 21 lakhs
- Rs. 15 lakhs
- Rs. 20 lakhs
29. What will Rs.1500 amount to in three years if it is invested in 20% p.a. compound interest, interest being compounded annually?
- 2400
- 2592
- 2678
- 2540
30. If a sum of money grows to 144/121 times when invested for two years in a scheme where interest is compounded annually, how long will the same sum of money take to treble if invested at the same rate of interest in a scheme where interest is computed using simple interest method?
- 9 years
- 22 years
- 18 years
- 33 years