7589 – ? = 3434
Question:
7589 – ? = 3434
[A].
4242
4155
1123
11023
7589 – ? = 3434
[A].
[B].
[C].
[D].
Answer: Option B
Explanation:
Let 7589 -x = 3434
Then, x = 7589 – 3434 = 4155
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A bag contains 4 white, 5 red and 6 blue balls. Three balls are drawn at random from the bag. The probability that all of them are red, is:
Question:
A bag contains 4 white, 5 red and 6 blue balls. Three balls are drawn at random from the bag. The probability that all of them are red, is:
[A].1 22 [B].
3 22 [C].
2 91 [D].
2 77 Answer: Option C
Explanation:
Let S be the sample space.
Then, n(S) = number of ways of drawing 3 balls out of 15 = 15C3 = (15 x 14 x 13) (3 x 2 x 1) = 455. Let E = event of getting all the 3 red balls.
n(E) = 5C3 = 5C2 = (5 x 4) = 10. (2 x 1) P(E) = n(E) = 10 = 2 . n(S) 455 91 Find a positive number which when increased by 17 is equal to 60 times the reciprocal of the number.
Question:
Find a positive number which when increased by 17 is equal to 60 times the reciprocal of the number.
[A].3 [B].
10 [C].
17 [D].
20 Answer: Option A
Explanation:
Let the number be x.
Then, x + 17 = 60 x x2 + 17x – 60 = 0
(x + 20)(x – 3) = 0
x = 3.
A can finish a work in 24 days, B in 9 days and C in 12 days. B and C start the work but are forced to leave after 3 days. The remaining work was done by A in:
Question:
A can finish a work in 24 days, B in 9 days and C in 12 days. B and C start the work but are forced to leave after 3 days. The remaining work was done by A in:
[A].5 days [B].
6 days [C].
10 days [D].
10 1 days 2 Answer: Option C
Explanation:
(B + C)’s 1 day’s work = 1 + 1 = 7 . 9 12 36 Work done by B and C in 3 days = 7 x 3 = 7 . 36 12 Remaining work = 1 – 7 = 5 . 12 12 Now, 1 work is done by A in 1 day. 24 So, 5 work is done by A in 24 x 5 = 10 days. 12 12 A group of students decided to collect as many paise from each member of group as is the number of members. If the total collection amounts to Rs. 59.29, the number of the member is the group is:
Question:
A group of students decided to collect as many paise from each member of group as is the number of members. If the total collection amounts to Rs. 59.29, the number of the member is the group is:
[A].57 [B].
67 [C].
77 [D].
87 Answer: Option C
Explanation:
Money collected = (59.29 x 100) paise = 5929 paise.
Number of members = 5929 = 77.
A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will he take to go 5km in stationery water?
A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will he take to go 5km in stationery water?A. 40 Minutes
B. 1 Hour
C. 1 hr 15 Min
D. 1 Hr 30 Min
Explanation:
Speed upstream = 2km/hr.
Speed downstream = 6 km/hr
Speed in stationary water = ½ (6 + 2) km/hr = 4 km/hr
Time is taken to cover 5 km in stationary water
= (1/4 x 5) 1 hr 15 minOne card is drawn at random from a pack of 52 cards. What is the probability that the card drawn is a face card (Jack, Queen and King only)?
Question: One card is drawn at random from a pack of 52 cards. What is the probability that the card drawn is a face card (Jack, Queen and King only)?
[A].1 13 [B].
3 13 [C].
1 4 [D].
9 52 Answer: Option B
Explanation:
Clearly, there are 52 cards, out of which there are 12 face cards.
P (getting a face card) = 12 = 3 . 52 13