Directions (Q. 1 –5): In the following number series one number is wrong. Find out the wrong number.
1. 267, 263, 251, 230, 203, 167
2. 135, 45, 18, 10, 6, 6
3. 45, 48. 5, 55.5, 65, 80, 97.5
4. 856, 452, 250, 149, 98, 73.25
5. 739, 758, 720, 737, 705, 718, 688
Directions (Q. 6-7): Study the information given below and answer the questions carefully:
Ramesh, Dinesh and Ganesh completed a job in 12 days. They worked together for 4 days in which they completed 44% of the total work. But due to unavoidable circumstances Ramesh quits the job at this point. Work done by Dinesh in 3 days is equal to the work done by Ganesh in 4 days.
6. Find the time taken by the fastest worker to complete the job.
7. Find by what per cent the slowest worker is less efficient than the second fastest worker?
8. A right angle triangle with height 5 cm and base 12 cm. This triangle is rotated once accordingly its heights. Find the curved surface area of the cone obtained?
9. What value should come in the place of question mark (?) in the following question?
sqroot(729) + 5^2 = ? × 13
10. 4 litres of wine are drawn from a cask containing 40 litres of wine and It is replaced by water. The process is repeated 5 times. Find out the ratio of wine to water finally. (Approximately)