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 ?

Explanation

Given, 'Fruit is sweet' ≡ '479'...(i)

'Very sweet voice' ≡ '248'...(ii)

and 'Eat fruit daily' ≡ '637'...(iii)

From equations (i) and (ii) sweet' is coded as '4'.

From equations (i) and (iii), fruit' is coded as '7'.

From equation (i), 'is' is coded as '9'.