[B].
[C].
[D].
Answer: Option A
Explanation:
Numbers are alternatively multiplied by 2 and increased by 3.
So, the missing number = 61 x 2 = 122.
A. Rs.140
B. Rs.120
C. Rs.130
D. Rs.110
E. None of these.
[B].
[C].
[D].
Answer: Option C
Explanation:
Let total number of children be x.
| Then, x x | 1 | x = | x | x 16 x = 64. |
| 8 | 2 |
| Number of notebooks = | 1 | x2 = | 1 | x 64 x 64 | = 512. | ||
| 8 | 8 |
[B].
[C].
[D].
Answer: Option C
Explanation:
Go on multiplying the number by 2 and adding 1 to it to get the next number.
So, 27 is wrong.
| 9 | 1 | days |
| 5 |
[B].
| 9 | 2 | days |
| 5 |
[C].
| 9 | 3 | days |
| 5 |
[D].
Answer: Option C
Explanation:
| (A + B + C)’s 1 day’s work = | 1 | , |
| 4 |
| A’s 1 day’s work = | 1 | , |
| 16 |
| B’s 1 day’s work = | 1 | . |
| 12 |
| C’s 1 day’s work = | 1 | – | 1 | + | 1 | = | 1 | – | 7 | = | 5 | . | ||||
| 4 | 16 | 12 | 4 | 48 | 48 |
| So, C alone can do the work in | 48 | = 9 | 3 | days. |
| 5 | 5 |
[B].
[C].
[D].
Answer: Option B
Explanation:
| This is a G.P. in which a = 2, r = | 22 | = 2 and n = 9. |
| 2 |
| Sn = | a(rn – 1) | = | 2 x (29 – 1) | = 2 x (512 – 1) = 2 x 511 = 1022. |
| (r – 1) | (2 – 1) |
[B].
[C].
[D].
Answer: Option D
Explanation:
| Amount of Rs. 100 for 1 year when compounded half-yearly |
= Rs. | 100 x | 1 + | 3 | 2 | = Rs. 106.09 | |||||
| 100 |
Effective rate = (106.09 – 100)% = 6.09%