Aptitude | Odd Man Out And Series

445, 221, 109, 46, 25, 11, 4

Byadmin July 18, 2022

Question: 445, 221, 109, 46, 25, 11, 4
[A].

221

[B].

109

[C].

[D].

Answer: Option C

Explanation:

Go on subtracting 3 and dividing the result by 2 to obtain the next number.

Clearly, 46 is wrong.

Aptitude | Problems On Trains

A train travelling at a speed of 75 mph enters a tunnel 3 miles long. The train is mile long. How long does it take for the train to pass through the tunnel from the moment the front enters to the moment the rear emerges?

Question: A train travelling at a speed of 75 mph enters a tunnel 3 miles long. The train is mile long. How long does it take for the train to pass through the tunnel from the moment the front enters to the moment the rear emerges?
[A].

2.5 min
[B].
3 min
[C].
3.2 min
[D].
3.5 min

Answer: Option B

Explanation:

Total distance covered

= 7 + 1 miles

2 4

= 15 miles.

4

Time taken

= 15 hrs

4 x 75

= 1 hrs

20

= 1 x 60 min.

20

= 3 min.

Read More A train travelling at a speed of 75 mph enters a tunnel 3 miles long. The train is mile long. How long does it take for the train to pass through the tunnel from the moment the front enters to the moment the rear emerges?
Compound Interest | Mathematics Mcqs

In one year, the population, of a village increased by 10% and in the next year, it decreased by 10%. If at the end of 2nd year, the population was 7920, what was it in the beginning?

In one year, the population, of a village increased by 10% and in the next year, it decreased by 10%. If at the end of 2nd year, the population was 7920, what was it in the beginning?

A. 8500
B. 8000
C. 8100
D. 8400

Read More In one year, the population, of a village increased by 10% and in the next year, it decreased by 10%. If at the end of 2nd year, the population was 7920, what was it in the beginning?
Aptitude | Height And Distance

The angle of elevation of a ladder leaning against a wall is 60° and the foot of the ladder is 4.6 m away from the wall. The length of the ladder is:

Question: The angle of elevation of a ladder leaning against a wall is 60° and the foot of the ladder is 4.6 m away from the wall. The length of the ladder is:
[A].

2.3 m
[B].
4.6 m
[C].
7.8 m
[D].
9.2 m

Answer: Option D

Explanation:

Let AB be the wall and BC be the ladder.

Then, ACB = 60° and AC = 4.6 m.

AC = cos 60° = 1

BC 2

BC = 2 x AC

= (2 x 4.6) m

= 9.2 m.

Read More The angle of elevation of a ladder leaning against a wall is 60° and the foot of the ladder is 4.6 m away from the wall. The length of the ladder is:

Aptitude | Probability

Two dice are thrown simultaneously. What is the probability of getting two numbers whose product is even?

Question:
Two dice are thrown simultaneously. What is the probability of getting two numbers whose product is even?

[A].

[B].

[C].

[D].

Answer: Option B

Explanation:

In a simultaneous throw of two dice, we have n(S) = (6 x 6) = 36.

Then, E

= {(1, 2), (1, 4), (1, 6), (2, 1), (2, 2), (2, 3), (2, 4), (2, 5), (2, 6), (3, 2), (3, 4),
(3, 6), (4, 1), (4, 2), (4, 3), (4, 4), (4, 5), (4, 6), (5, 2), (5, 4), (5, 6), (6, 1),
(6, 2), (6, 3), (6, 4), (6, 5), (6, 6)}

n(E) = 27.

P(E) =	n(E)	=	27	=	3	.
	n(S)		36		4

Compound Interest | Mathematics Mcqs

If Rs.7500 are borrowed at C.I at the rate of 4% per annum, then after 2 years the amount to be paid is_______?

If Rs.7500 are borrowed at C.I at the rate of 4% per annum, then after 2 years the amount to be paid is_______?

A. Rs.8082
B. Rs.7800
C. Rs.8100
D. Rs.8112
Explanation:
A = 7500(26/25)2 = 8112

Read More If Rs.7500 are borrowed at C.I at the rate of 4% per annum, then after 2 years the amount to be paid is_______?
Compound Interest | Mathematics Mcqs

The compound interest earned by Sunil on a certain amount at the end of two years at the rate of 8% p.a. was Rs.2828.80. Find the total amount that Sunil got back at the end of two years in the form of principal plus interest earned.

The compound interest earned by Sunil on a certain amount at the end of two years at the rate of 8% p.a. was Rs.2828.80. Find the total amount that Sunil got back at the end of two years in the form of principal plus interest earned.

A. Rs.18,828.80
B. Rs.19,828.80
C. Rs.18,028.80
D. Rs.17,828.80
E. None of these
Explanation:
Let the sum be Rs.P
P{ [ 1 + 8/100]2 – 1 } = 2828.80
P(8/100)(2 + 8/100) = 2828.80 [a2 – b2 = (a – b) ( a + b)] P = 2828.80 / (0.08)(2.08) = 1360/0.08 = 17000 Principal + Interest = Rs. 19828.80

Read More The compound interest earned by Sunil on a certain amount at the end of two years at the rate of 8% p.a. was Rs.2828.80. Find the total amount that Sunil got back at the end of two years in the form of principal plus interest earned.

AC	= cos 60° =	1
BC	= cos 60° =	2

BC	= 2 x AC
	= (2 x 4.6) m
	= 9.2 m.

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