If the code for 'HELLO' is '851212', what is the code for 'WORLD'?

D. 231418

If A=1, B=2, C=3, ..., Z=26, what is the code for the word 'CAT'?

A. 3-1-20

In a coding system where A=2, B=4, C=6, ..., Z=52, what is the code for the word 'DOG'?

A. 8-14-12

In a coding scheme, 'TREE' is represented as 20, 22, 24, 26 and 'LEAF' as 12, 14, 16, 18. What is the code for 'BARK'?

A. 2, 4, 6, 8

If 'COLD' is coded as 3, 15, 12, 4 and 'WARM' is coded as 23, 1, 18, 13, what is the code for 'HARD'?

A. 8, 1, 18, 4