In a certain code, '786' means 'study very hard', '958' means 'hard work pays' and '645' means 'study and work'. Which of the following is the code for 'very' ?
In a certain code language, '479' means 'fruit is sweet';
'248' means 'very sweet voice' and
'637' means 'eat fruit daily'.
Which digit stands for 'is' in that code ?