[B].
[C].
[D].
Answer: Option C
Explanation:
617.00
6.017
0.617
+ 6.0017
——–
629.6357
———
A. Rs 6500
B. Rs 6565
C. Rs 65065
D. Rs 65650
Explanation:
Let the sum be Rs x.
Then [x × (1 +10/100)2 – x] – (x × 10/100 × 2) = 65
=> (x × 11/10 × 11/10 – x) – x/5 = 65
=> (121x/100 – x) – x/5 = 65
=> (21x/100 – x/5) = 65
=> (21x – 20x) = 6500
=> X = 6500
[B].
[C].
[D].
Answer: Option C
Explanation:
| Speed = | 45 x | 5 | m/sec | = | 25 | m/sec. | ||
| 18 | 2 |
Time = 30 sec.
Let the length of bridge be x metres.
| Then, | 130 + x | = | 25 |
| 30 | 2 |
2(130 + x) = 750
x = 245 m.
Video Explanation: https://youtu.be/M_d8WufJWKc
[B].
[C].
[D].
Answer: Option A
Explanation:
Number of valid votes = 80% of 7500 = 6000.
Valid votes polled by other candidate = 45% of 6000
| = | 45 | x 6000 | = 2700. | ||
| 100 |
[B].
[C].
[D].
Answer: Option C
Explanation:
Let the numbers be 2x and 3x.
Then, their L.C.M. = 6x.
So, 6x = 48 or x = 8.
The numbers are 16 and 24.
Hence, required sum = (16 + 24) = 40.
| 3 |
| 5 |
[B].
| 3 |
| 10 |
[C].
| 4 |
| 5 |
[D].
| 4 |
| 3 |
Answer: Option C
Explanation:
| Let the required fraction be x. Then | 1 | – x = | 9 |
| x | 20 |
| 1 – x2 | = | 9 | |
| x | 20 |
20 – 20×2 = 9x
20×2 + 9x – 20 = 0
20×2 + 25x – 16x – 20 = 0
5x(4x + 5) – 4(4x + 5) = 0
(4x + 5)(5x – 4) = 0
| x = | 4 |
| 5 |
[B].
[C].
[D].
Answer: Option A
Explanation:
Let the numbers be a, b and c.
Then, a2 + b2 + c2 = 138 and (ab + bc + ca) = 131.
(a + b + c)2 = a2 + b2 + c2 + 2(ab + bc + ca) = 138 + 2 x 131 = 400.
(a + b + c) = 400 = 20.
Video Explanation: https://youtu.be/qmJ-0X8j_xQ