Find out decimal equivalent of 27 in octal number system:

Correct option is C

To convert the octal number 27octal27_{octal}27
​ to its decimal (base-10) equivalent, we follow these steps:

$$27_{octal} = 2 \times 8^1 + 7 \times 8^0$$

$$2 \times 8^1 = 2 \times 8 = 16$$,    $$7 \times 8^0 = 7 \times 1 = 7$$

$$27_{octal} = 16 + 7 = 23$$​​​