Aptitude | Percentage

A fruit seller had some apples. He sells 40% apples and still has 420 apples. Originally, he had:

Byadmin July 18, 2022

Question: A fruit seller had some apples. He sells 40% apples and still has 420 apples. Originally, he had:
[A].

588 apples

[B].

600 apples

[C].

672 apples

[D].

700 apples

Answer: Option D

Explanation:

Suppose originally he had x apples.

Then, (100 – 40)% of x = 420.

	60	x x = 420
	100

x =		420 x 100	= 700.
		60

Video Explanation: https://youtu.be/-Pv25Do3WwY

Compound Interest | Mathematics Mcqs

There is 60% increase in an amount in 6 years at S.I. What will be the C.I. of Rs. 12,000 after 3 years at the same rate?

There is 60% increase in an amount in 6 years at S.I. What will be the C.I. of Rs. 12,000 after 3 years at the same rate?

A. Rs. 2160
B. Rs. 3120
C. Rs. 3972
D. Rs. 6240
Explanation:
Let P = Rs. 100. Then, S.I. Rs. 60 and T = 6 years.
R = (100 * 60)/(100 * 6) = 10% p.a.
Now, P = Rs. 12000, T = 3 years and R = 10% p.a.
C.I. = [12000 * {(1 + 10/100)3 – 1}]
= 12000 * 331/1000 = Rs. 3972

Read More There is 60% increase in an amount in 6 years at S.I. What will be the C.I. of Rs. 12,000 after 3 years at the same rate?
Aptitude | Pipes And Cistern

Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank?

Question:
Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank?

[A].

10 min. 20 sec.
[B].
11 min. 45 sec.
[C].
12 min. 30 sec.
[D].
14 min. 40 sec.

Answer: Option D

Explanation:

Part filled in 4 minutes = 4 1 + 1 = 7 .

15 20 15

Remaining part = 1 – 7 = 8 .

15 15

Part filled by B in 1 minute = 1

20

1 : 8 :: 1 : x

20 15

x = 8 x 1 x 20 = 10 2 min = 10 min. 40 sec.

15 3

The tank will be full in (4 min. + 10 min. + 40 sec.) = 14 min. 40 sec.

Read More Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank?
Aptitude | Numbers

The sum of first 45 natural numbers is:

Question:
The sum of first 45 natural numbers is:

[A].

1035
[B].
1280
[C].
2070
[D].
2140

Answer: Option A

Explanation:

Let Sn = (1 + 2 + 3 + … + 45)

This is an A.P. in which a = 1, d = 1, n = 45 and l = 45

Sn = n (a + l) = 45 x (1 + 45) = (45 x 23) = 1035

2 2

Required sum = 1035.

Read More The sum of first 45 natural numbers is:
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:
Aptitude | Stocks And Shares

Which is better investment: 11% stock at 143 or 9% stock at 117?

Question:
Which is better investment: 11% stock at 143 or 9% stock at 117?

[A].

11% stock at 143
[B].

9 3 % stock at 117

4

[C].
Both are equally good
[D].
Cannot be compared, as the total amount of investment is not given.

Answer: Option B

Explanation:

Let investment in each case be Rs. (143 x 117).

Income in 1st case = Rs. 11 x 143 x 117 = Rs. 1287.

143

Income in 2nd case = Rs. 39 x 143 x 117 = Rs. 1394.25

4 x 117

Clearly, 9 3 % stock at 117 is better.

4

Read More Which is better investment: 11% stock at 143 or 9% stock at 117?
Aptitude | Volume And Surface Area

A right triangle with sides 3 cm, 4 cm and 5 cm is rotated the side of 3 cm to form a cone. The volume of the cone so formed is:

Question: A right triangle with sides 3 cm, 4 cm and 5 cm is rotated the side of 3 cm to form a cone. The volume of the cone so formed is:
[A].

12 cm3
[B].
15 cm3
[C].
16 cm3
[D].
20 cm3

Answer: Option A

Explanation:

Clearly, we have r = 3 cm and h = 4 cm.

Volume = 1 r2h = 1 x x 32 x 4 cm3 = 12 cm3.

3 3

Video Explanation: https://youtu.be/Njsid2mVwUY

Read More A right triangle with sides 3 cm, 4 cm and 5 cm is rotated the side of 3 cm to form a cone. The volume of the cone so formed is:

Part filled in 4 minutes = 4		1	+	1		=	7	.
		15		20			15

Remaining part =		1 –	7		=	8	.
			15			15

Part filled by B in 1 minute =	1
	20

x =		8	x 1 x 20		= 10	2	min = 10 min. 40 sec.
		15				3

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