Correct Answer: 24

Solution : Given:
SUNDAY = 18, YEAR = 12 then THURSDAY = ?

Multiply the number of letters of SUNDAY by three, to get the required code –
Number of letters in SUNDAY = 6, 6 × 3 = 18
Thus, SUNDAY is coded as 18.
And, YEAR = 12 –
Number of letters in YEAR = 4, 4 × 3 = 12
Thus, YEAR is coded as 12.
Similarly, follow the same pattern for THURSDAY –
Number of letters in THURSDAY = 8, 8 × 3 = 24

Thus, THURSDAY is coded as 24. Hence the first option is correct.