Solving Logic Problem

 Logic (from the Greek λογική logikē) is the study of reasoning. Logic is used in most intellectual activity, but is studied primarily in the disciplines of philosophy, mathematics, and computer science. Logic examines general forms which arguments may take, which forms are valid, and which are fallacies. It is one kind of critical thinking. (Source Wikipedia)

Solving Logic Problems:

The solving method of age logic problems are given as follow:

Problem 1:

Alexander’s father is 50 years. He is 20 years older than twice Alexander’s age. How old is Alexander?

Solving method of given logic problem:

Alexander’s father age = 50 years.

Alexander’s age twice his father age .

Let assume 2x

2x + 20 = 50

2x = 50 – 20 = 30

X = 50/2 =25

Answer : Alexander’s age is 25 years.

Problem 2:

In sixteen years, Maria will be 8 times as old as she was towel years ago. How old is she now?

Solving method of given logic problem :

Assume age now = y

y+16=8(y-12)
y+16=8y-96
7y = 112
y = 16
16 yrs old

Solving Logic Problems:

Problem 3;

½  of Richard’s age 2 years from now plus 1/3 of his age 3 years ago is 20 years. How old is he now?

This problem denotes to Richard’s age 2 years in the future and 3 years in the past. So we will take a variable and label everything clearly:

Solving method of logic problem:

Present age: R
age 2 years from present: R + 2
age 3 years ago:  R – 3

Now we want  fractions of these ages:

1/2 of age 2 years from present:  ( 1/2 )(R + 2) = R/2 + 1
1/3 of age 3 years ago:  ( 1/3 )(R – 3) = R/3 – 1

The total of these 2 numbers is 20, so we will add them and set this equal to 20:

R/2 + 1 + R/3 – 1 = 20
R/2 + R/3 = 20
3R + 2R = 120
5R = 120
R = 24

Richard’s age is 24 years old.

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