The ▭ represents a set of calculations that are common across all the given equations. Identify the calculations involved and solve the third equation on the same basis:

25 ▭ 36 = 5 ; 6 ; 11

100 ▭ 64 = 10 ; 8 ; 18

36 ▭ 81 = ? ; ? ; ?

​$$\sqrt25=5$$

5 + 6 = 11

10 + 8 = 18

So, the missing numbers are 6 ; 9 ; 15.

Thus, the correct option is: (d)