Given numbers: 418        128         347         759         521

Subtracting 1 from middle number of each number:

408        118        337        749        511

Interchanging first and third digits within each number:

804        811        733        947        115

The second largest number is 811, which came from the number 128.

Given numbers: 418        128         347         759         521

Reversing first two digits in each number:

148        218        437        579        251

Highest and lowest numbers are 579 and 148 respectively.

First digit in 579 is 5 and first digit in 148 is 1.

The difference between 5 and 1 is 4.

Hence, the required number is 4.

Given numbers: 418        128         347         759         521

Reversing the positions of the digits within each number:

814        821        743        957        125

Arranging the above numbers in ascending order:

125        743        814        821        957

Third number from the left is 814.

Last digit of 814 is 4.

Hence, the required number is 4.

Given numbers: 418        128         347         759         521

Interchanging first and third digits within each number:

814        821        743        957        125

The second highest number is 821.

The third digit of 821 is 1.

If last alphabet of every words changed to next alphabet, we get

WIU BAS URO ELG TOQ

Only two words are there which have two vowels i.e. WIU & URO.

Hence, the correct answer is two. 

when consonants is changed to previous letter and vowels are changed to next letter of alphabetical series, we get 

VJS ABQ VQM FKE SPO

Only two words which has no vowel i.e. VJS & VQM

when we arranged all the alphabets according to alphabetical order, we get

ITW ABR NRU EFL OPT 

Only one letter is not begin with vowel i.e. NRU.

Hence, the correct answer is one.

Given series: A % 5 U 3 # D & I O 3 $ 2 4 S 8 L A 3 V 5 E @ O 5

If we have a combination of different directions like Left – Right, Right – left then we does the addition of the number of positions.

Like, 17 + 6 = 23 and then we count the elements.

I 4 N 5 6 C 7 5 O 6 8 G 3 N 8 I 4 T O 8 M 5 O 3 D 3 4 6 E

Given series: A % 5 U 3 # D & I O 3 $ 2 4 S 8 L A 3 V 5 E @ O 5

After dropping all the numbers we get,

New series: A % U # D & I O $ S L A V E @ O

If we have a combination of different directions like Left – Right, Right – left then we does the addition of the number of positions.

Like, 9 + 3 = 12 and then we count the elements.

A % U # D & I O $ S L A V E @ O

Hence, the correct answer is A.

Given series: A % 5 U 3 # D & I O 3 $ 2 4 S 8 L A 3 V 5 E @ O 5

After dropping all the consonants we get-

New series: A % 5 U 3 # & I O 3 $ 2 4 8 A 3 5 E @ O 5

Now fourth vowel from right end is O.

A % 5 U 3 # & I O 3 $ 2 4 8 A 3 5 E @ O 5

The third element to the left of the fourth vowel from the right end is #.

Hence, the correct answer is #.

Given series: A % 5 U 3 # D & I O 3 $ 2 4 S 8 L A 3 V 5 E @ O 5

We know, consonants are the letters other than vowels (A, E, I, O, U).

We need combination = number → symbols → consonant.

A % 5 U 3 # D & I O 3 $ 2 4 S 8 L A 3 V 5 E @ O 5

Here we get only one symbol which is immediately followed by a consonant and immediately preceded by a number.

Hence, the correct answer is 1.

Given series: A % 5 U 3 # D & I O 3 $ 2 4 S 8 L A 3 V 5 E @ O 5

We know, consonants are the letters other than vowels (A, E, I, O, U).

A % 5 U 3 # D & I O 3 $ 2 4 S 8 L A 3 V 5 E @ O 5

Here we get two even numbers which are immediately followed by a consonant.

Hence, the correct answer is 2.

Given series: 4 8 3 6 2 1 7 5 9 7 8 3 6 1 5 9 7 3 4 5 0 7 5 3 1 4 0 8 2 6

There are total 30 numbers in the series.

Odd prime numbers in the series (written in bold) = 4 8 3 6 2 1 7 5 9 7 8 3 6 1 5 9 7 3 4 5 0 7 5 3 1 4 0 8 2 6

So, there are total 12 odd prime numbers in the given series.

Hence, option 4 is correct.

Given series: 4 8 3 6 2 1 7 5 9 7 8 3 6 1 5 9 7 3 4 5 0 7 5 3 1 4 0 8 2 6

There are total 30 numbers in the series.

Composite numbers in the series (written in bold) = 4 8 3 6 2 1 7 5 9 7 8 3 6 1 5 9 7 3 4 5 0 7 5 3 1 4 0 8 2 6

So, there are total 11 composite numbers in the given series.

Hence, option 4 is correct.

Given series: 4 8 3 6 2 1 7 5 9 7 8 3 6 1 5 9 7 3 4 5 0 7 5 3 1 4 0 8 2 6

Number which is 7th to the right of the number, which is 7th from the left end = 14th from the left end

4 8 3 6 2 1 7 5 9 7 8 3 6 1 5 9 7 3 4 5 0 7 5 3 1 4 0 8 2 6

So, 1 is 7th to the right of the number, which is 7th from the left end.

Hence, option 3 is correct.