Given a math word problem, answer the following question. You might need to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the question and then only report the final numerical answer.

[EX Q]: iesha has 344 books . 136 are about school and the rest are about sports . how many books about sports does iesha have ?
[EX A]: 208

[EX Q]: ethan has 31 presents . alissa has 22 more than ethan . how many presents does alissa have ?
[EX A]: 53

[EX Q]: the host prepared 19 cakes for the party . after the party he had 9 left . how many cakes did people eat in the party ?
[EX A]:
10