# NRA CGL (National Recruitment Agency-Combined Graduate Level) Mathematics: Questions 409 - 413 of 425

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## Question number: 409

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MCQ▾

### Question

In a school with 900 students, the average age of boys is 12 years and that of the girls is 11 years and 6 months. If the average age of the school is 11 years and 9 months, then the number of the girls in the school is

### Choices

Choice (4)Response

a.

390

b.

450

c.

760

d.

460

## Question number: 410

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MCQ▾

### Question

A and B working together take 9 and 25 less days than A alone and B alone respectively to do a work. The number of days taken by A and B working together to do the work is

### Choices

Choice (4)Response

a.

18

b.

17

c.

16

d.

15

## Question number: 411

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MCQ▾

### Question

A and B working together take 12 and 27 less days than A alone and B alone respectively to do a work. The number of days taken by A and B working together to do the work is

### Choices

Choice (4)Response

a.

17

b.

15

c.

16

d.

18

## Question number: 412

Edit
MCQ▾

### Question

The average marks of 30 students in a test is 60. Later it is found that three marks 55,65& 50 were wrongly entered as 53,68 & 59. The average marks after mistakes were rectified is

### Choices

Choice (4)Response

a.

95.67

b.

59.67

c.

d.

## Question number: 413

Edit
MCQ▾

### Question

A person covers a distance from his home to office in 30 minutes if he drives his car with the speed of 50 km/hr. find the speed of his car in return journey, if the duration of return journey increases by 20 minutes.

### Choices

Choice (4)Response

a.

b.

c.

d.

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