[B].
[C].
[D].
Answer: Option B
Explanation:
4 x 162 = 648. Sum of decimal places = 6.
So, 0.04 x 0.0162 = 0.000648 = 6.48 x 10-4
[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 B
Explanation:
Increase in 10 years = (262500 – 175000) = 87500.
| Increase% = | 87500 | x 100 | % = 50%. | |
| 175000 |
| Required average = | 50 | % = 5%. | |
| 10 |
A. 10 %
B. 12 %
C. 6 %
D. 8 %
Explanation:
5000 × (1 +R/100) 2 – 5000 –(10000R/100)= 72
=> 5000 [(1 + R/100) 2 – 1 – R/50] = 72
=> 1 + R2/100 + 2R/100 – 1 – R/50 = 72/5000
=> R2 = (72/5000 × 10000) = 144 or R =12%
[B].
[C].
[D].
Answer: Option B
Explanation:
Let the numbers be x and y.
Then, xy = 120 and x2 + y2 = 289.
(x + y)2 = x2 + y2 + 2xy = 289 + (2 x 120) = 529
x + y = 529 = 23.
A. 4 : 3
B. 3 : 2
C. 6 : 5
D. 7 : 6
E. None of these
Explanation:
Let x be the investment of Rayan in 6% and y be in 7%
x(6)(n)/100 = y(7)(n)/100
=> x/y = 7/6
x : y = 7 : 6
| 1 |
| 5 |
[B].
| 2 |
| 9 |
[C].
| 23 |
| 99 |
[D].
| 23 |
| 100 |
Answer: Option C
Explanation:
| 0.232323… = 0.23 = | 23 |
| 99 |