In a coding system, 'HELLO' is represented as '85121215'. What is the code for 'WORLD'?

A. 231815124

Which number is different from the others?

D. 24

In a certain code, 'FISH' is coded as 'GJTI'. What is the code for 'BIRD'?

A. CJSE

Find the number that does not fit with the others.

D. 40

Find the missing letter in the series: z, x, v, t, ?

C. Q