Question: Provide a step by step solution for the following math problem: Mazie has 52 marbles and gives them to twins, Dallas and Darla.  If Dallas has a total of 21 marbles after dropping 4 of them in the playground, how many did Mazie give to Darla?
Answer: 
Mazie gave Dallas 21 + 4 = 25 marbles.
Darla has 52 - 25 = 27 marbles.