Hey there! As it states in the question, there's six packages, each containing 125 envelopes.
So, to get our answer, we need to multiply the packages (6), by 125 envelopes.
125 * 6 =n But, we can break that down.
100 * 6=600
25 * 6 =150
Now we add up both products, and the sum ends up being 750, which is also your final answer.