[B].
[C].
[D].
Answer: Option C
Explanation:
3.14 x 106 = 3.14 x 1000000 = 3140000.
[B].
[C].
[D].
Answer: Option C
Explanation:
Clearly, the numbers which have 1 or 9 in the unit’s digit, have squares that end in the digit 1. Such numbers from 1 to 70 are 1, 9, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69.
Number of such number =14
| Required percentage = | 14 | x 100 | % = 20%. | |
| 70 |
Video Explanation: https://youtu.be/cBamI6iRNIA
[B].
[C].
[D].
Answer: Option B
Explanation:
Let 0.0169 x x = 1.3.
Then, 0.0169x = (1.3)2 = 1.69
| x = | 1.69 | = 100 |
| 0.0169 |
[B].
[C].
[D].
Answer: Option A
Explanation:
Let the ten’s digit be x.
Then, unit’s digit = x + 2.
Number = 10x + (x + 2) = 11x + 2.
Sum of digits = x + (x + 2) = 2x + 2.
(11x + 2)(2x + 2) = 144
22×2 + 26x – 140 = 0
11×2 + 13x – 70 = 0
(x – 2)(11x + 35) = 0
x = 2.
Hence, required number = 11x + 2 = 24.
[B].
[C].
[D].
Answer: Option A
Explanation:
L.C.M. of 21, 36, 66 = 2772.
Now, 2772 = 2 x 2 x 3 x 3 x 7 x 11
To make it a perfect square, it must be multiplied by 7 x 11.
So, required number = 22 x 32 x 72 x 112 = 213444
| 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 C
Explanation:
The pattern is 12, 22, 32, 42, 52, 62, 72. But, instead of 52, it is 20 which to be turned out.