[B].
[C].
[D].
Answer: Option C
Explanation:
3.14 x 106 = 3.14 x 1000000 = 3140000.
[B].
[C].
[D].
Answer: Option A
Explanation:
The numbers are squares of odd natural numbers, starting from 5 up to 15.
So, 36 is wrong.
A. 50km
B. 60km
C. 70km
D. 80 km
Explanation:
Let the distance between the two parts be x km.
Then speed downstream = x/4 km/hr.
Speed Upstream = x/5 km/hr
Speed of the stream = ½ (x/4 –x/5)
Therefore, ½(x/4 –x/5) = 2. => x/4 –x/5 = 4 => x = 80.
Hence, the distance between the two ports is 80km.
[B].
[C].
[D].
Answer: Option A
Explanation:
Let the length of each train be x metres.
Then, distance covered = 2x metres.
Relative speed = (46 – 36) km/hr
| = | 10 x | 5 | m/sec | |
| 18 |
| = | 25 | m/sec | |
| 9 |
| 2x | = | 25 | |
| 36 | 9 |
2x = 100
x = 50.
[B].
[C].
[D].
Answer: Option C
Explanation:
6) 4456 (742
42
—
25
24 Therefore, Required number = (6 – 4) = 2.
—
16
12
—
4
[B].
[C].
[D].
Answer: Option A
Explanation:
Let Sn = (1 + 2 + 3 + … + 45)
This is an A.P. in which a = 1, d = 1, n = 45 and l = 45
| Sn = | n | (a + l) | = | 45 | x (1 + 45) = (45 x 23) = 1035 |
| 2 | 2 |
Required sum = 1035.
[B].
[C].
[D].
Answer: Option A
Explanation:
Originally, let the number of seats for Mathematics, Physics and Biology be 5x, 7x and 8x respectively.
Number of increased seats are (140% of 5x), (150% of 7x) and (175% of 8x).
| 140 | x 5x | , | 150 | x 7x | and | 175 | x 8x | |||||||
| 100 | 100 | 100 |
| 7x, | 21x | and 14x. |
| 2 |
| The required ratio = 7x : | 21x | : 14x |
| 2 |
14x : 21x : 28x
2 : 3 : 4.