1. A person invested Rs 4400 in two parts one at 6% and the other at 10% rate of interest. If his over all gain is 9%, find the money invested at 6% interest.
60002. The average age of P and Q is 20 years. If R were to replace P, the average would be 19 and if R were to replace Q, the average would be 21. What are the age of P, Q and R?
22, 18, 20
20, 20, 18
18, 22, 20
18, 20, 22
None of these3. 3 years ago the average age of a family of 5 members was 17 years. With the birth of a new baby, the average age of six members remains the same even today. Find the age of the new baby.
1 1/2 year
None of these4. The average of a batsman for 40 innings is 50 runs. His highest score exceeds his lowest score by 172 runs. If these two innings are excluded, his average drops by 2 runs. Find his highest score.
None of these5. A family consists of grandparents, parents and three grandchildren. The average age of the grandparents is 67 years, that of the parents is 35 years and that of the grandchildren is 6 years. What is the average age of the family?
None of these
6. A man traveled one-third of journey with 10 m/sec; Two-third of remaining journey with 20 m/sec; rest of the journey with 30 m/sec. What is his average speed for whole journey in m/sec?
None of these7. Six litres of a 20% solution of alcohol in water are mixed with 4 litres of a 60% solution of alcohol in water. Find the percentage of alcohol in the mixture.
None of these8. A company blends two varieties of tea from two different tea gardens, one variety costing Rs 20 per kg and other Rs 25 per kg, in the ratio 5 : 4. He sells the blended tea at Rs 23 per kg. Find his profit percent.
No profit, no loss
None of these9. The amount of water (in ml) that should be added to reduce 9 ml lotion, containing 50% alcohol, to a lotion containing 30% alcohol, is:
None of these10. 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 score for all the three classes?
None of these