Question

Some of the room numbers of the adjoining rooms in a hostel are 6A, 12C, 18E, and 24G. Find the next room number.

• A. 36F
• B. 36I
• C. 30H
• D. 30I

Answer 1

The correct option is D 30I

The given room numbers are 6A, 12C, 18E, and 24G.

Each room number has two components: a number and a letter.

Let's look at the numbers first.

6, 12, 18, 24

$6+6=12$
$12+6=18$
$18+6=24$

$\therefore$ The next number will be $24+6=30.$

Let us now look at the letters.
A, C, E, G

By assigning numbers to the letters of the English alphabet, we get:


$\therefore$ The numbers corresponding to the letters A, C, E, and G:
1, 3, 5, 7

The next number in the above pattern is 9.

The letter corresponding to 9 is I.

∴ The next room number is 30I.