In a certain code language, '251' means 'Water is Black', '509' means 'Black Her Eyes' and '981' means 'Eyes Like Water'. Find the code for 'is'.

2

Given; In a certain code language, '251' means 'Water is Black', '509' means 'Black Her Eyes' and '981' means 'Eyes Like Water'.

So,

2   5   1  =  water  is  black

5   0   9  =  black   her   eyes

9   8   1  =  eyes   like   water

Thus,

Code for water is 1, black is 5, code for eyes is 9, her is 0, like is 8

And,

Code for Is is 2.