In a class of 30 students, A is ranked 10th from the top. What is A's rank from the bottom?

B. 21ST

In a certain code, 'HELLO' is coded as 85121215. What is the code for 'WORLD'?

A. 231815124

In a certain language, 'CAT' is written as 'DBU'. How is 'DOG' written in that language?

A. EPH

In a race of 40 participants, D finishes 15th. If E finishes 5 places behind D, what is E's rank from the bottom?

B. 22ND

What is the solution to the equation 3x + 4 = 10?

A. X = 2