Aptitude | Area

The length of a rectangle is halved, while its breadth is tripled. What is the percentage change in area?

Byadmin July 18, 2022

Question:
The length of a rectangle is halved, while its breadth is tripled. What is the percentage change in area?

[A].

25% increase

[B].

50% increase

[C].

50% decrease

[D].

75% decrease

Answer: Option B

Explanation:

Let original length = x and original breadth = y.

Original area = xy.

New length =	x	.
	2

New breadth = 3y.

New area =		x	x 3y		=	3	xy.
		2				2

Increase % =		1	xy x	1	x 100	%	= 50%.
		2		xy

Aptitude | Odd Man Out And Series

40960, 10240, 2560, 640, 200, 40, 10

Question:
40960, 10240, 2560, 640, 200, 40, 10

[A].

640
[B].
40
[C].
200
[D].
2560

Answer: Option C

Explanation:

Go on dividing by 4 to get the next number.

So, 200 is wrong.

Read More 40960, 10240, 2560, 640, 200, 40, 10
Aptitude | Time And Work

A takes twice as much time as B or thrice as much time as C to finish a piece of work. Working together, they can finish the work in 2 days. B can do the work alone in:

Question: A takes twice as much time as B or thrice as much time as C to finish a piece of work. Working together, they can finish the work in 2 days. B can do the work alone in:

[A].

4 days
[B].
6 days
[C].
8 days
[D].
12 days

Answer: Option B

Explanation:

Suppose A, B and C take x, x and x days respectively to finish the work.

2 3

Then, 1 + 2 + 3 = 1

x x x 2

6 = 1

x 2

x = 12.

So, B takes (12/2) = 6 days to finish the work.

Read More A takes twice as much time as B or thrice as much time as C to finish a piece of work. Working together, they can finish the work in 2 days. B can do the work alone in:
Basic Maths Mcqs | Boats and Streams | Mathematics Mcqs

A person can row at 9 kmph and still water. He takes 4 1/2 hours to row from A to B and back. What is the distance between A and B if the speed of the stream is 1 kmph?

A person can row at 9 kmph and still water. He takes 4 1/2 hours to row from A to B and back. What is the distance between A and B if the speed of the stream is 1 kmph?

A. 32 km
B. 25 km
C. 28 km
D. 24 km
E. None of these
Explanation:
Let the distance between A and B be x km.
Total time = x/(9 + 1) + x/(9 – 1) = 4.5
=> x/10 + x/8 = 9/2 => (4x + 5x)/40 = 9/2 => x = 20 km.

Read More A person can row at 9 kmph and still water. He takes 4 1/2 hours to row from A to B and back. What is the distance between A and B if the speed of the stream is 1 kmph?
Aptitude | Problems On Ages

The age of father 10 years ago was thrice the age of his son. Ten years hence, father’s age will be twice that of his son. The ratio of their present ages is:

Question: The age of father 10 years ago was thrice the age of his son. Ten years hence, father’s age will be twice that of his son. The ratio of their present ages is:
[A].

5 : 2
[B].
7 : 3
[C].
9 : 2
[D].
13 : 4

Answer: Option B

Explanation:

Let the ages of father and son 10 years ago be 3x and x years respectively.

Then, (3x + 10) + 10 = 2[(x + 10) + 10]

3x + 20 = 2x + 40

x = 20.

Required ratio = (3x + 10) : (x + 10) = 70 : 30 = 7 : 3.

Read More The age of father 10 years ago was thrice the age of his son. Ten years hence, father’s age will be twice that of his son. The ratio of their present ages is:
Compound Interest | Mathematics Mcqs

Every year an amount increases by 1/8th of itself. How much will it be after two years if its present value is Rs.64000?

Every year an amount increases by 1/8th of itself. How much will it be after two years if its present value is Rs.64000?

A. Rs.81000
B. Rs.80000
C. Rs.75000
D. Rs.64000
Explanation:
64000* 9/8 * 9/8 = 81000

Read More Every year an amount increases by 1/8th of itself. How much will it be after two years if its present value is Rs.64000?
Aptitude | Problems On Trains

Two stations A and B are 110 km apart on a straight line. One train starts from A at 7 a.m. and travels towards B at 20 kmph. Another train starts from B at 8 a.m. and travels towards A at a speed of 25 kmph. At what time will they meet?

Question: Two stations A and B are 110 km apart on a straight line. One train starts from A at 7 a.m. and travels towards B at 20 kmph. Another train starts from B at 8 a.m. and travels towards A at a speed of 25 kmph. At what time will they meet?
[A].

9 a.m.
[B].
10 a.m.
[C].
10.30 a.m.
[D].
11 a.m.

Answer: Option B

Explanation:

Suppose they meet x hours after 7 a.m.

Distance covered by A in x hours = 20x km.

Distance covered by B in (x – 1) hours = 25(x – 1) km.

20x + 25(x – 1) = 110

45x = 135

x = 3.

So, they meet at 10 a.m.

Read More Two stations A and B are 110 km apart on a straight line. One train starts from A at 7 a.m. and travels towards B at 20 kmph. Another train starts from B at 8 a.m. and travels towards A at a speed of 25 kmph. At what time will they meet?

Suppose A, B and C take x,	x	and	x	days respectively to finish the work.
	2		3

Then,		1	+	2	+	3		=	1
		x		x		x			2

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