# Aptitude [3i Infotech Placement]: Sample Questions 20 - 22 of 76

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## Question 20

### Question

MCQ▾The value of B in the equation is

### Choices

Choice (4) | |
---|---|

a. | |

b. | |

c. | |

d. |

### Answer

d.### Explanation

The given equation is

This equation matches with the option d.

## Question 21

### Question

MCQ▾In objective test a correct answer score 4 marks and on a wrong answer 2 marks are negative. A student scores 480 marks from 150 questions. How many answers were correct?

### Choices

Choice (4) | |
---|---|

a. | 110 |

b. | 130 |

c. | 150 |

d. | 120 |

### Answer

b.### Explanation

In an objective test, every correct answer will get + 4 marks and every wrong answer will get -2 marks.

A student scores 480 marks from 150 questions.

We are asked to find the correct answers given by student. Let it be x.

So,

So, student has answered 130 correct questions.

## Question 22

### Question

MCQ▾A postal truck leaves its station and heads for Chicago, averaging 40mph. An error in the mailing schedule is spotted and 24 minutes after the truck leaves, a car is sent to overtake the truck. If the car averages 50mph then how long will it take to catch the postal truck?

### Choices

Choice (4) | |
---|---|

a. | 1.5 hours |

b. | 1.6 hours |

c. | 2 hours |

d. | 3 hours |

### Answer

c.### Explanation

A postal truck leaves the station and heads for Chicago, averaging 40 mph.

An error in the mailing schedule is spotted and 24 minutes after the truck leaves, a car is sent to overtake the truck. The speed of car is 50mph.

Distance covered by both truck and car is same.

Let time taken by truck is x minutes and car is taking minutes.

So, Car will take 2 hours time to catch the postal truck.