Answer:
Alex had 22 toy cars in the beginning of this story
Explanation:
Initially, Alex had Y cars.
He gave 11 of them to his friend.
So then he had Y - 11 cars.
Later his dad bought him twice as many toy cars as he had in the beginning.
Now he had Y - 11 + 2Y = 3Y - 11 cars.
How many toy cars did Alex have in the beginning of this story if now he has 55 of them?
Now we have that:
3Y - 11 = 55
3Y = 66
Y = 66/3
Y = 22
Alex had 22 toy cars in the beginning of this story