Answer:
Pierre has sent 1/3, or 4/12 of the packages so far.
Explanation:
There are a total of 12 packages Pierre has send. The denominator is 12 (whole).
He sent two on Monday, so 2 would be a part of the whole. Pierre has sent 2/12 of the boxes on Monday.
He sent another two on Tuesday, which is another 2/12.
2/12 + 2/12 = 4/12
Pierre has sent 4/12 of the boxes so far.
You can simplify 4/12 by dividing both the numerator and demoninator by 4 (a common factor).
4/12 divided by 4/4 is equal to 1/3.
4/12 = 1/3