Answer:
Darrell has 5 toy cars left
Explanation:
So he started with 13.
13
He buys 22 cars from the toy store.
+22
He gets 21 cars for his birthday.
+21
13 + 22 + 21 = 56
He has 56.
But he then gave 5 of them to his sister.
-5
He then gives 46 to his friend Wayne.
-46
56 - 5 - 46 = 5
He currently has 5 toys left.
In bold = numbers in the equations
Underlined = What happened for him to gain or to lose toy cars.