If 1/2 of 5 is 3, then what is 1/3 of 10?
Answer
4.
If half of 5 is 3, then half of 10 is 6, based on proportion. Since 2/3 of 1/2 is 1/3 (2/3 x 1/2 = 1/3), 2/3 of 6 is 4.
Another alternative is to round up the answer to the nearest integer.
1/2 x 5 = 2.5, round up to 3
1/3 x 10 = 3.3, round up to 4