If $137 + 276 = 435$ how much is $731+672?$
(137)8 + (276)8 = (435)8
So basically the number are given in Octal base.
Similarly, addition of 731,672 gives 1623 in octal.
Why not (A)?
- probably because
"How much is..." is asked, which signifies quantity, which means the individual terms are supposed to be treated as numbers.
If asked as "What is ..." then the question will become ambiguous and option (A) will be equally rightful candidate for the correct option, since the question can be interpreted as an encoding scheme.
This is Octal number and this is how we have to solve it
@Nikhil Prasad But it can be other base also like base 9, and so on..best way is to assume it as some base x and then convert them into decimal...