- A well with 28 m inside diameter is dug out 18 m deep. The earth taken out of it has been evenly spread all around it to a width of 21 m to form an embarkment. Find the height of the embarkment.
36247Option A

22/7[(R2) – (r2)] * h = 22/7(7*7*18)

[(352) – (72)]h = 14 * 14 * 18

(42*28)h = 14*14*18

h = 3 m - Raj is 25 years old. If Suraj’s age is 25% greater than that of Raj then how much percent Raj’s age is less than Suraj’s age?
50%20%40%30%60%Option B

Percentage decrease = 25/125 * 100 = 20% - The population of a village has increased annually at the rate of 20%. If at the end of 3 years it is 21600, the population in the beginning of the first year?
1220011245125001200012450Option C

21600 = P*(1 + 20/100)^3

= 12500 - A Person borrows Rs. 8000 at 20% compound rate of interest. At the end of each year he pays back Rs. 3000. How much amount should he pay at the end of the third year to clear all his dues?
45604620550059044000Option D

At the end of 1st year = 8000+1600= 9600

Amount = 9600 – 3000 = 6600

At the end of 2nd year = 6600+1320 = 7920

Amount = 7920 – 3000 = 4920

Amount to be paid at the end of 3rd year = 4920 + 984 = 5904 - 12 Persons are seated at a circular table. Find the probability that 3 particular persons always seated together.
7/556/553/554/552/55Option C

Total probability = (12-1)! = 11!

Desired probability = (10 – 1)! = 9!

So, p = (9! *3!) /11! = 3/55 - 4 6 18 49 201 1011
201496181011Option D

4 × 1 + 2 = 4 + 2 = 6

6 × 2 + 3 = 12 + 3 = 15 == 18

15 × 3 + 4 = 45 + 4 = 49

49 × 4 + 5 = 196 + 5 = 201

201 × 5 + 6 = 1005 + 6 = 1011 - 48 72 108 162 243 366
4872108366243Option D

48 ×3/2 = 72; 72 ×3/2 = 108

108 × 3/2= 162: 162 × 3/2 = 243

243 ×3/2 = 364.5 == 366 - 2 54 300 1220 3674 7350
12203003674254Option C

2 × 6 + 7 × 6 = 12 + 42 = 54

54 × 5 + 6 × 5 = 270 + 30 = 300

300 × 4 + 5 × 4 = 1200 + 20 = 1220

1220 × 3 + 4 × 3 = 3660 + 12

= 3672 == 3674

3672 × 2 + 3 × 2 = 7344 + 6 = 7350 - 8 27 64 125 218 343
86421827125Option C

2^3 = 8 : 3^3 = 27

4^3 = 64 : 5^3 = 125

6^3 = 216 == 218

7^3 = 343 - 19 68 102 129 145 154
1451968102154Option D

19 + 7^2 = 19 + 49 = 68

68 + 6^2 = 68 + 36 = 104== 102

104 + 5^2 = 104 + 25 = 129

129 + 4^2 = 129 + 16 = 145

145 + 3^2 = 145 + 9 = 154

**Directions(6-10):** Find the wrong number of the following series.