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.

she then went to 3 orphanages and donated a total of $ 650 . if she gave $ 175 to the first orphanage and $ 250 to the third how much did she donate to the second orphanage ?
225

ellen has 6 more balls than marin . marin has 9 balls . how many balls does ellen have ?
15

scott and sam decided to sell their old comic books . they had 90 comic books altogether . after the sale they only had 25 comic books . how many comic books did scott and sam sell ?
65