Directions (1-3): In the following number series only one number is wrong. Find out the wrong number.

1. 1     1     2     6     30     212     2310
1) 2
2) 6
3) 30
4) 212
5) 2310

2. 1     1.4     1.96     2.776     4.1208     6.0208
1) 1.4
2) 1.96
3) 2.776
4) 4.1208
5) 6.0208

3.      1     7     19     43     91     186     379
1) 19
2) 43
3) 91
4) 186
5) 379

4.Five alarms start to ring together and ring at the intervals of 3, 4, 6, 11 and 12 seconds respectively. How many times will they ring together in one hour, excluding the one at the start?
1) 24 times
2) 25 times
3) 26 times
4) 27 times
5) 28 times

5.What is the number which, when added to the terms of the ratio 17 : 29 makes the new ratio
7 : 11?
1) 3
2) 4
3) 5
4) 6
5) 7

6.A person sells one house for Rs 75 lakhs, making profits of 25%. He sells another house at a loss of 20%, and on the whole he makes neither profit nor loss. What is the cost of the second house?
1) 50 lakhs
2) 60 lakhs
3) 75 lakhs
4) 90 lakhs
5) None of these

7.Ravi and Raj invested in the ratio of 4 : 3 in a business. If 16% of the total profit goes to charity and Ravi’s share of profit is Rs 816, what is the amount of total profit?
1) Rs 1200
2) Rs 1400
3) Rs 1500
4) Rs 1700
5) None of these

8.The average of the first and second of three numbers is 12 more than the average of the second and the third of these numbers. What is the difference between the first and the third of these three numbers?
1) 6
2) 12
3) 24
4) 36
5) 18

9.A person completes journey by using three different types of vehicles. He completes first part with speed of 10 kmph, second part at the speed of 12 kmph and third part at the speed of 15 kmph. If the distance travelled by each vehicle is equal then what is the average speed of that person throughout the journey?
1) 12 kmph
2) 12.5 kmph
3) 13 kmph
4) 13.5 kmph
5) None of these

10.If the ratio of the ages of A and B at present is 7 : 4. After 12 years the ratio of their ages will be 10 : 7, what is the present age of B?
1) 12 years
2) 14 years
3) 16 years
4) 18 years
5) 20 years

Answers with Explanation !!!!!!!