Answer:
3/12 or 1/4
Step-By-Step:
First of all, convert 2/3 to _/12. To do this, simply multiply 2/3 by 4/4. This is to get 12 as the denominator, and as we know, whatever you do to the denominator, you do to the numerator.
We get 8/12, and then we add 1/12 to get the total amount he spent. We get 9/12.
After that, to get the remaining amount, we do 1 or 12/12 - 9/12 = 3/12 or 1/4.
So the answer is 3/12 or 1/4