1, 1, 2, 6, 24, 96, 720
Question:
1, 1, 2, 6, 24, 96, 720
[A].
720
96
24
6
1, 1, 2, 6, 24, 96, 720
[A].
[B].
[C].
[D].
Answer: Option B
Explanation:
Go on multiplying with 1, 2, 3, 4, 5, 6 to get next number.
So, 96 is wrong.
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It takes eight hours for a 600 km journey, if 120 km is done by train and the rest by car. It takes 20 minutes more, if 200 km is done by train and the rest by car. The ratio of the speed of the train to that of the cars is:
Question:
It takes eight hours for a 600 km journey, if 120 km is done by train and the rest by car. It takes 20 minutes more, if 200 km is done by train and the rest by car. The ratio of the speed of the train to that of the cars is:
[A].2 : 3 [B].
3 : 2 [C].
3 : 4 [D].
4 : 3 Answer: Option C
Explanation:
Let the speed of the train be x km/hr and that of the car be y km/hr.
Then, 120 + 480 = 8 1 + 4 = 1 ….(i) x y x y 15 And, 200 + 400 = 25 1 + 2 = 1 ….(ii) x y 3 x y 24 Solving (i) and (ii), we get: x = 60 and y = 80.
Ratio of speeds = 60 : 80 = 3 : 4.
(935421 x 625) = ?
Question:
(935421 x 625) = ?
[A].575648125 [B].
584638125 [C].
584649125 [D].
585628125 Answer: Option B
Explanation:
935421 x 625 = 935421 x 54 = 935421 x 10 4 2 = 935421 x 104 = 9354210000 24 16 = 584638125
A, B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 252 seconds, B in 308 seconds and c in 198 seconds, all starting at the same point. After what time will they again at the starting point ?
Question:
A, B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 252 seconds, B in 308 seconds and c in 198 seconds, all starting at the same point. After what time will they again at the starting point ?
[A].26 minutes and 18 seconds [B].
42 minutes and 36 seconds [C].
45 minutes [D].
46 minutes and 12 seconds Answer: Option D
Explanation:
L.C.M. of 252, 308 and 198 = 2772.
So, A, B and C will again meet at the starting point in 2772 sec. i.e., 46 min. 12 sec.
A, B and C jointly thought of engaging themselves in a business venture. It was agreed that A would invest Rs. 6500 for 6 months, B, Rs. 8400 for 5 months and C, Rs. 10,000 for 3 months. A wants to be the working member for which, he was to receive 5% of the profits. The profit earned was Rs. 7400. Calculate the share of B in the profit.
Question:
A, B and C jointly thought of engaging themselves in a business venture. It was agreed that A would invest Rs. 6500 for 6 months, B, Rs. 8400 for 5 months and C, Rs. 10,000 for 3 months. A wants to be the working member for which, he was to receive 5% of the profits. The profit earned was Rs. 7400. Calculate the share of B in the profit.
[A].Rs. 1900 [B].
Rs. 2660 [C].
Rs. 2800 [D].
Rs. 2840 Answer: Option B
Explanation:
For managing, A received = 5% of Rs. 7400 = Rs. 370.
Balance = Rs. (7400 – 370) = Rs. 7030.
Ratio of their investments = (6500 x 6) : (8400 x 5) : (10000 x 3)
= 39000 : 42000 : 30000
= 13 : 14 : 10
B’s share = Rs. 7030 x 14 = Rs. 2660. 37 A boat running upstream takes 8 hours 48 minutes to cover a certain distance, while it takes 4 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and speed of the water current respectively?
Question:
A boat running upstream takes 8 hours 48 minutes to cover a certain distance, while it takes 4 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and speed of the water current respectively?
[A].2 : 1 [B].
3 : 2 [C].
8 : 3 [D].
Cannot be determined Answer: Option C
Explanation:
Let the man’s rate upstream be x kmph and that downstream be y kmph.
Then, distance covered upstream in 8 hrs 48 min = Distance covered downstream in 4 hrs.
x x 8 4 = (y x 4) 5 44 x =4y 5 y = 11 x. 5 Required ratio = y + x : y – x 2 2 = 16x x 1 : 6x x 1 5 2 5 2 = 8 : 3 5 5 = 8 : 3.
The difference between simple and compound interests compounded annually on a certain sum of money for 2 years at 4% per annum is Re. 1. The sum (in Rs.) is:
Question:
The difference between simple and compound interests compounded annually on a certain sum of money for 2 years at 4% per annum is Re. 1. The sum (in Rs.) is:
[A].625 [B].
630 [C].
640 [D].
650 Answer: Option A
Explanation:
Let the sum be Rs. x. Then,
C.I. = x 1 + 4 2 – x = 676 x – x = 51 x. 100 625 625 S.I. = x x 4 x 2 = 2x . 100 25 51x – 2x = 1 625 25 x = 625.