Numerical Ability Easy Questions and Answers

It takes 30 minutes to empty a half-full tank by draining it at a constant rate, It is decided to simultaneously pump water into the half-full tank while draining it. What is the rate at which water has to be pumped in so that it gets fully filled in 10 minutes?

Total volume = 60 S tank
(s¹ )(10) – (s)10 = 30s
s¹ (s) – s = 3s
s¹ = 4s
s¹ = 4 drawing rate

Correct Option: A

Total volume = 60 S tank
(s¹ )(10) – (s)10 = 30s
s¹ (s) – s = 3s
s¹ = 4s
s¹ = 4 drawing rate

The total exports and revenues from the exports of a country are given in the two charts shown below. The pie chart for exports shows the quantity of each item exported as a percentage of the total quantity of exports. The pie chart for the revenues shows the percentage of the total revenue generated through export of each item. The total quantity of exports of all the items is 500 thousand tonnes and the total revenues are 250 crore rupees. Which item among the following has generated the maximum revenue per kg?

Item: 2

20	× 250 × 10⁷
100

20	× 500 × 10³
100

0.5 × 10⁴ = 5 × 10³ = Item 2
Item : 3

	23 × 250 × 10⁷
	19 × 500 × 10³

1.2 = Item 3
Item : 6

	19	= 1.18 = Item 6
	16

Item : 5

	20	=	5	= 1.6 ⇒ 1.6 = Item 5
	12		3

Correct Option: D

Item: 2

20	× 250 × 10⁷
100

20	× 500 × 10³
100

0.5 × 10⁴ = 5 × 10³ = Item 2
Item : 3

	23 × 250 × 10⁷
	19 × 500 × 10³

1.2 = Item 3
Item : 6

	19	= 1.18 = Item 6
	16

Item : 5

	20	=	5	= 1.6 ⇒ 1.6 = Item 5
	12		3

The sum of eight consecutive odd numbers is 656. The average of four consecutive even numbers is 87. What is the sum of the smallest odd number and second largest even number?

Eight consecutive odd number = 656
a – 6, a – 1, a – 2, a, a + 2, a + 4, a + 6 a + 8 = 656
a = 81 ................(1)
Smallest m = 75
Average consecutive even numbers

⇒	a - 2 + a + a + 2 + a + 4	= 87
	4

⇒ a = 86
Second largest number = 88
1 + 2 = 163

Correct Option: C

Eight consecutive odd number = 656
a – 6, a – 1, a – 2, a, a + 2, a + 4, a + 6 a + 8 = 656
a = 81 ................(1)
Smallest m = 75
Average consecutive even numbers

⇒	a - 2 + a + a + 2 + a + 4	= 87
	4

⇒ a = 86
Second largest number = 88
1 + 2 = 163

Fill in the missing number in the series.
2 3 6 15 _?_ 157.5 630

	2nd number	is in increasing order as shown above
	1st number

Correct Option: A

	2nd number	is in increasing order as shown above
	1st number

A regular die has six sides with numbers 1 to 6 marked on its sides. If a very large number of throws show the following frequencies of occurrence:
1→ 0, 167; 2 → 0, 167; 3 → 0, 152; 4 → 0,166; 5 → 0,168; 6 → 0, 180. We call this die

For a very large number of throws, the frequency should be same for unbiased throw. As it not same, then the die is baised.

Correct Option: B

For a very large number of throws, the frequency should be same for unbiased throw. As it not same, then the die is baised.