There are many types of Logical puzzles & Maths Puzzles asked in various types of Aptitude Exams. These types of questions are explained one by one.

E – 5^{th}, J – 10^{th}, O – 15^{th}, T – 20^{th}, Y – 25^{th}

Now for instance, we wish to find the 12^{th} letter from the left side. We know that O is the 10^{th} letter. Therefore L will be the 12^{th} letter of the alphabet.

Let us say that there are seven boys standing in a row, ABCDEFG. If we see that C is standing on 3^{rd} position from the left while standing 5^{th} from the right. The sum of both the positions is 5+ 3 = 8 while total number of students is 7. So if position is given from Left side, subtract it from total number of students and then add one. This will give you the position from the right side.

There are a few examples given of Number series:

101, 102, 104, 107, 111, 116….

In the example above we can see that differences between two consecutive terms given are 1, 2, 3, 4 & 5 respectively. Therefore the next difference has to be 6. The next term therefore should be 116 + 6 = 122.

1, 3, 8, 19, 42…

In this example we can see that second term is given by multiplying first term by 2 and then adding 1, third term is given by multiplying second term by 2 and then adding 2, next multiplying by 2 and then adding 3, then multiplying by 4 and then adding 4, so next term has to be 42 * 5 = 170 + 1 = 171.

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4, 2, 2, 3, 6, 15, 45…

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In the above example,

4*0.5 = 2

2*1= 2

2* 1.5 = 3

3*2 = 6

6* 2.5 = 15

15 * 3 = 45

Therefore next term will be 45 * 3.5 = 157.5