# 3i Infotech Papers: Sample Questions 13 - 15 of 1245

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## Question number: 13

MCQ▾

### Question

Which of the following equations can be used to find a number x, if the difference between the square of this number and 21 is the same as the product of 4 times the number?

### Choices

Choice (4) Response

a.

b.

c.

d.

b.

### Explanation

The difference between the square of this number and 21 is the same as the product of 4 times the number.

The number x square is x2. So,

This is the same equation as given in option b.

## Question number: 14

MCQ▾

### Question

In a class of 40 students, 30 speak French and 20 speak German. What is the lowest possible number of students who speak both languages?

### Choices

Choice (4) Response

a.

5

b.

10

c.

20

d.

15

b.

### Explanation

In a class of 40 students, 30 can speak French and 20 can speak German.

As there are only 40 students, there are some students who can speak both the languages.

We know,

So,

So, lowest possible numbers of students who can speak both the languages are 10.

## Question number: 15

### Write in Short

City A’s population is 68000, decreasing at a rate of 80 people per year. City B having population 42000 is increasing at a rate of 120 people per year. In how many years both the cities will have same population?

### Explanation

City A’s population is 68000, decreasing at a rate of 80 people per year.

City B’s population is 42000, increasing at a rate of 120 people per year.

Let in p years population of both cities be same.

So,

So, in 130 years population of both cities will be same.