**Logical Problems Aptitude basics, practice questions, answers and explanations **

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**Logical Problems**** **** **

LOGIC, is the ‘science of thought as expressed in language’. This means that the questions on logic are to be solved as per the information given without any concern of the formal validity or truth of the statements ‘i.e. conclusion should follow directly from the statements given.

**Examples : **

1. A software engineer has the capability of thinking 100 lines of code in five minutes and can type 100 lines of code in 10 minutes. He takes a break for five minutes after every ten minutes. How many lines of codes will he complete typing after an hour?

a)250

b)220

c)150

d)200

** ****Ans: a**** **

**Explanation:** First, 5 five minutes he thinks, next five minutess he write code then takes a break. So for the first 15 mins he writes 50 lines of code. Next 5 minutes he write, then 5 min. think & 5 minutes rest. Next 10 minutes write, then 5 minutes rest. Next 5 minutes think, 5 minutes write and 5 minutes he takes rest. 25 minutes he write. In 10 min he writes 100 lines. So in 25 min. 250 lines.

a)2

b)3

c)4

d)5

**Ans:c**** **

**Explanation:** 40 goes into the piggy bank leaving Rs.210 for expenses. Normal expense on lunch is Rs.75 and on bus Rs.48, leaving Rs.87. Nikhil is short of Rs.13 for the book. For this, if he saves bus fares, he must walk four times saving Rs.16, and then he is left with Rs.3 after buying the book. Hence option c.

a) Akshar,

b) Brinda,

c) Cathy

d) Dinesh

**Ans:b**

**Explanation:** Since the economics, psychology and medicine students do not cook breakfast, the mechanical engineering student does, and that is Akshar. Cathy teaches drawing. Now, since Brinda does not teach reading and writing, she must be teaching Maths. So option b.

a) 21 hours

b) 12 hours

c) 18 hours

d) 15 hours

**Ans:c**

**Explanation:** Every hour, he gains 3 ft and loses 2 ft, for a total gain of 1 ft. So after the 17th hour, he's at 17 ft high. in the 18th hour, he climbs up 3 feet. Since 17 ft + 3 ft = 20 ft, he's at the top of the tree. So option c.

a) 450

b) 451

c) 350

d) 425

**Ans:b**

**Explanation:**There are 60 minutes in an hour. In ¾ of an hour there are (60 * ¾) minutes = 45 minutes. In ¾ of an hour there are (60 * 45) seconds = 2700 seconds. Light flashed for every 6 seconds. In 2700 seconds 2700/6 = 450 times. The count start after the first flash, the light will flashes 451 times in ¾ of an hour. So option b.

**Directions (Q. 6- 10) : There are five friends Sachin, Kunal, Mohit, Anuj and Rohan. Sachin ia shorter than Kunal but taller than Rohan. Mohit is tallest. Anuj is a little shorter than Kunal and little taller than Sachin.**

a)Rohan

b)Sachin

c)Anuj

d)Kunal

**Answer: a**** **

**Explanation:**

Let us denote the five boys by the first letter of their names,namely S, K, M, A and R.

Then , R < S < K < M and S < A < K.

R < S < A < K < M

Rohan is shortest.

a)Kunal

b)Rohan

c) Sachin

d)Anuj

** Answer: d**** **** **

**Explanation:**

R < S < A < K < M

Anuj is in the middle.

a) Anuj

b) Sachin

c) Rohan

d)Kunal

**Answer: b**** **

**Explanation:**

R < S < A < K < M.

In the order of increasing heights i,e shortest to tallest, Sachin is second.

a) Sachin

b) Kunal

c) Anuj

d) Rohan

**Answer: b**** **

**Explanation:**

R < S < A < K < M

Kunal is second tallest.

a) Kunal

b) Rohan

c) Sachin

d)Data Inadequate

**Answer: a**** **

**Explanation:**

R < S < A < K < M.

Kunal is taller than Anuj but shorter than Mohit.