Aptitude | Decimal Fraction

3.87 – 2.59 = ?

Byadmin July 18, 2022

Question:
3.87 – 2.59 = ?

[A].

1.20

[B].

1.2

[C].

1.27

[D].

1.28

Answer: Option D

Explanation:

3.87 – 2.59 = (3 + 0.87) – (2 + 0.59)

=		3 +	87		–		2 +	59
			99					99

= 1 +		87	–	59
		99		99

= 1 +	28
	99

= 1.28.

Aptitude | Boats and Streams

The speed of a boat in still water in 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minutes is:

Question: The speed of a boat in still water in 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minutes is:
[A].

1.2 km
[B].
1.8 km
[C].
2.4 km
[D].
3.6 km

Answer: Option D

Explanation:

Speed downstream = (15 + 3) kmph = 18 kmph.

Distance travelled = 18 x 12 km = 3.6 km.

60

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

Read More The speed of a boat in still water in 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minutes is:
Compound Interest | Mathematics Mcqs

A sum amount to Rs.1344 in two years at simple interest. What will be the compound interest on the same sum at the same rate of interest for the same period?

A sum amount to Rs.1344 in two years at simple interest. What will be the compound interest on the same sum at the same rate of interest for the same period?

A. Rs.150
B. Rs.140
C. Rs.130
D. Data insufficient for the answer

Read More A sum amount to Rs.1344 in two years at simple interest. What will be the compound interest on the same sum at the same rate of interest for the same period?
Aptitude | Ratio and Proportion

Seats for Mathematics, Physics and Biology in a school are in the ratio 5 : 7 : 8. There is a proposal to increase these seats by 40%, 50% and 75% respectively. What will be the ratio of increased seats?

Question:
Seats for Mathematics, Physics and Biology in a school are in the ratio 5 : 7 : 8. There is a proposal to increase these seats by 40%, 50% and 75% respectively. What will be the ratio of increased seats?

[A].

2 : 3 : 4
[B].
6 : 7 : 8
[C].
6 : 8 : 9
[D].
None of these

Answer: Option A

Explanation:

Originally, let the number of seats for Mathematics, Physics and Biology be 5x, 7x and 8x respectively.

Number of increased seats are (140% of 5x), (150% of 7x) and (175% of 8x).

140 x 5x , 150 x 7x and 175 x 8x

100 100 100

7x, 21x and 14x.

2

The required ratio = 7x : 21x : 14x

2

14x : 21x : 28x

2 : 3 : 4.

Read More Seats for Mathematics, Physics and Biology in a school are in the ratio 5 : 7 : 8. There is a proposal to increase these seats by 40%, 50% and 75% respectively. What will be the ratio of increased seats?
Aptitude | Races and Games

In 100 m race, A covers the distance in 36 seconds and B in 45 seconds. In this race A beats B by:

Question:
In 100 m race, A covers the distance in 36 seconds and B in 45 seconds. In this race A beats B by:

[A].

20 m
[B].
25 m
[C].
22.5 m
[D].
9 m

Answer: Option A

Explanation:

Distance covered by B in 9 sec. = 100 x 9 m = 20 m.

45

A beats B by 20 metres.

Read More In 100 m race, A covers the distance in 36 seconds and B in 45 seconds. In this race A beats B by:
Alligation Or Mixture | Aptitude

8 litres are drawn from a cask full of wine and is then filled with water. This operation is performed three more times. The ratio of the quantity of wine now left in cask to that of water is 16 : 65. How much wine did the cask hold originally?

Question: 8 litres are drawn from a cask full of wine and is then filled with water. This operation is performed three more times. The ratio of the quantity of wine now left in cask to that of water is 16 : 65. How much wine did the cask hold originally?
[A].

18 litres
[B].
24 litres
[C].
32 litres
[D].
42 litres

Answer: Option B

Explanation:

Let the quantity of the wine in the cask originally be x litres.

Then, quantity of wine left in cask after 4 operations = x 1 – 8 4 litres.

x

x(1 – (8/x))4 = 16

x 81

1 – 8 4 = 2 4

x 3

x – 8 = 2

x 3

3x – 24 = 2x

x = 24.

Read More 8 litres are drawn from a cask full of wine and is then filled with water. This operation is performed three more times. The ratio of the quantity of wine now left in cask to that of water is 16 : 65. How much wine did the cask hold originally?
Aptitude | Numbers

Which one of the following is not a prime number?

Question: Which one of the following is not a prime number?
[A].

31
[B].
61
[C].
71
[D].
91

Answer: Option D

Explanation:

91 is divisible by 7. So, it is not a prime number.

Read More Which one of the following is not a prime number?

Distance travelled =		18 x	12	km = 3.6 km.
			60

		140	x 5x		,		150	x 7x		and		175	x 8x
		100					100					100

7x,	21x	and 14x.
	2

The required ratio = 7x :	21x	: 14x
	2

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