You are given a math word problem and you are supposed to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

[EX Q]: Wanda has 4 blocks . Theresa gives Wanda 79 more . How many blocks does Wanda have in all ?
[EX A]: 83

[EX Q]: You have collected 7 crickets . How many more crickets do you need to collect to have 11 crickets ?
[EX A]: 4

[EX Q]: Charlie has 31 more snowballs than Lucy . She has 19 snowballs . How many does Charlie have ?
[EX A]:
50