[B].
[C].
[D].
Answer: Option C
Explanation:
Each of the numbers except 21 is an even number.
[B].
[C].
[D].
Answer: Option B
Explanation:
Numbers are (23 – 1), (33 – 1), (43 – 1), (53 – 1), (63 – 1), (73 – 1) etc.
So, the next number is (83 – 1) = (512 – 1) = 511.
A. 70, 10 kmph
B. 35, 27 kmph
C. 50, 60 kmph
D. 45, 55 kmph
Explanation:
Speed of the boat in still water = (60+80)/2 = 70 kmph. Speed of the stream = (80-60)/2 = 10 kmph.
A. 16
B. 8
C. 12
D. 20
Explanation:
100 —- 200 —- 4
400 —- 4
800 —- 4
——
12 years
[B].
[C].
[D].
Answer: Option B
Explanation:
Required number = (L.C.M. of 12,16, 18, 21, 28) + 7
= 1008 + 7
= 1015
A. Rs. 550
B. Rs. 551.25
C. Rs. 560
D. Rs. 560.75
Explanation:
Let each installment be Rs. x. Then,
x/(1 + 5/100) + x/(1 + 5/100)2 = 1025
820x + 1025 * 441
x = 551.25
So, value of each installment = Rs. 551.25