If 20 + 3 = 15 and 15 + 4 = 30, then 12 + 6 = ?

Given: If 20 + 3 = 15 and 15 + 4 = 30

Logic: (Sum of 1st digit number + 2nd digit + 3rd digit) $$\times$$ 3 = 15​

For, 20 + 3 = 15

= (2 + 0 + 3) $$\times$$ 3

= 5 $$\times$$​ 3

= 15

For, 15 + 4 = 30

= (1 + 5 + 4) $$\times$$ 3

= 10 $$\times$$​ 3

= 30

Similarly,

12 + 6 = ?

= (1 + 2 + 6) $$\times$$ 3

= 9 $$\times$$​ 3

= 27

Thus, correct option is (b).