In a certain code language, 'health is wealth' is coded as '626', 'exercise regularly' is coded as '89' and 'bring good food' is coded as '544'. How will 'balanced diet is key' be coded in that language?

8423

Given; In a certain code language, 'health is wealth' is coded as '626', 'exercise regularly' is coded as '89' and 'bring good food' is coded as '544'.

The logic is;

(code is given as per the no. of letters in a word)

So,

1)  'health is wealth' is coded as '626'

health -> 6

is -> 2

wealth -> 6

2)  'exercise regularly' is coded as '89'

exercise -> 8

regularly -> 9

And,

3)  'bring good food' is coded as '544'

bring -> 5

good -> 4

food -> 4

Similarly,

 'balanced diet is key'....?

balanced -> 8

diet -> 4

is -> 2

key -> 3

Thus, 8423 is correct.