[B].
[C].
[D].
Answer: Option B
Explanation:
Let the middle digit be x.
Then, 2x = 10 or x = 5. So, the number is either 253 or 352.
Since the number increases on reversing the digits, so the hundred’s digits is smaller than the unit’s digit.
Hence, required number = 253.
| 1 |
| 5 |
[B].
| 2 |
| 9 |
[C].
| 23 |
| 99 |
[D].
| 23 |
| 100 |
Answer: Option C
Explanation:
| 0.232323… = 0.23 = | 23 |
| 99 |
[B].
[C].
[D].
Answer: Option D
Explanation:
Distance = (240 x 5) = 1200 km.
Speed = Distance/Time
Speed = 1200/(5/3) km/hr. [We can write 1 hours as 5/3 hours]
| Required speed = | 1200 x | 3 | km/hr | = 720 km/hr. | |
| 5 |
[B].
[C].
[D].
Answer: Option B
Explanation:
| (217)2 + (183)2 | = (200 + 17)2 + (200 – 17)2 |
| = 2 x [(200)2 + (17)2] [Ref: (a + b)2 + (a – b)2 = 2(a2 + b2)] | |
| = 2[40000 + 289] | |
| = 2 x 40289 | |
| = 80578. |
[B].
[C].
[D].
Answer: Option B
Explanation:
External radius = 4 cm,
Internal radius = 3 cm.
| Volume of iron |
|
||||||
|
|||||||
| = 462 cm3. |
Weight of iron = (462 x 8) gm = 3696 gm = 3.696 kg.
[B].
[C].
[D].
Answer: Option C
Explanation:
Let 4300731 – x = 2535618
Then x, = 4300731 – 2535618 = 1765113