69
Q:

# The ratio of earnings of A and B is 4:5. If the earnings of A increase by 20% and the earnings of B decrease by 20%, the new ratio of their earnings becomes 6:5. What are A's earnings?

 A) Rs.22,000 B) Rs.27,500 C) Rs. 26,400 D) Cannot be determined

Explanation:
Q:

2 is what percent of 50?

 A) 3 B) 4 C) 2.5 D) 5

Explanation:

Let p% of 50 is 2

=> p x 50/100 = 2

=> p = 4%

Hence, 2 is 4 percent of 50.

0 40
Q:

21% of 500 + 31% of 1100 - 30% of 790 = ?

 A) 209 B) 290 C) 309 D) 390

Explanation:

Given 21% of 500 + 31% of 1100 - 30% of 790 = ?

? = 21 x 5 + 31 x 11 - 3 x 79

? = 105 + 341 - 237

? = 446 - 237

? = 209.

2 111
Q:

In a city of engineers of 4800, the number of female engineers are 3/8th of them. The number of female engineers is what percentage of the number of male engineers?

 A) 76 B) 60 C) 56 D) 52

Explanation:

Total engineers = 4800

Number of female engineers = 3/8 x 4800 = 1800

Then, number of male engineers = 4800 - 1800 = 3000

Now, required is female engineers is what percentage of the number of male engineers

=> 1800 is what % of 3000

=> p x 3000/100 = 1800

=> 30p = 1800

p = 60%

Hence, female engineers is 60 percentage of the number of male engineers.

3 396
Q:

In a class 60% of the students pass in English and 45% pass in Hindi. If 25% of them pass in both subjects, what percentage of the students fail in both the subjects?

 A) 20% B) 25% C) 30% D) 15%

Explanation:

Percentage of students passed in English = 60%

Percentage of students passed in Hindi = 45%

Percentage of students passed in both subjects = 25%

ATQ,

Percentage of students passed in only English = 60 - 25 = 35%

Percentage of students passed in only Hindi = 45 - 25 = 20%

Therefore, Percentage of students failed = 100 - (35 + 25 + 20)

= 100 - 80 = 20%.

2 1021
Q:

75% of 450 + ? % of 560 = 600

 A) 52.385 B) 46.875 C) 42.155 D) 40.555

Explanation:

75% of 450 + ? % of 560 = 600

Hence, in the given question ? = 46.875

2 892
Q:

82.5% of 2360?

 A) 1960 B) 1954 C) 1947 D) 1931

Explanation:

Given 82.5% of 2360

5 730
Q:

When the price of whear was increased by 32%, a family reduced its consumption in such a way that the expenditure on wheat was only 10% more than before. If 30 kg per month were consumed before, find the new monthly consumption of family?

 A) 27 kgs B) 25 kgs C) 24 kgs D) 21 kgs

Explanation:

Initial wheat per kg cost be Rs. 100

Then, monthly expenditure of the family = 30 x 100 = 3000

After increase in cost,

Let P be new monthly consumption of family.

P x 132 = 110/100 x 3000

=> P = 25 kg.

2 1286
Q:

12% of 70,000 is

 A) 8400 B) 7200 C) 6000 D) 5600

Explanation:

12% of 70,000

=> 12 x 70,000/100

=> 8400

Hence, 12% of 70,000 = 8,400