Question: I would love to understand how to solve this problem: Alain's mom bought 5 packs of red pens and also bought twice the amount of black pens than the red. If each pack has 5 pens, how many pens does Alain have?
Can you explain?
Answer: 
Alain has a total of 5 x 5= 25 red pens.
And he has a total of 5 x 2 = 10 packs of black pens.
So, the total number of black pens he has is 10 x 5 = 50.
Therefore, the total number of pens he has is 50 + 25= 75.