In a certain code, 6218 means 'Laptop is a computer' and 8217 means 'Computer is a machine'. Which of the following id the code for 'Machine makes our life easy'?

75344

Given; In a certain code, 6218 means 'Laptop is a computer' and 8217 means 'Computer is a machine'. 

The logic here is;

(no. of letters present in a word)

1)  'Laptop is a computer' 

=> 6, 2, 1, 8

2) 'Computer is a machine'

=> 8, 2, 1, 7

Similarly,

3)  'Machine makes our life easy'

=> 7, 5, 3, 4, 4

Thus, 75344 is correct.