math
posted by allie .
there's a question that I don't understand and the direction says that
'solve problems as combination integer problems.remember to rewrite all double sign problems as combination problems before solving' and here's a question 50 61+  170 =

I believe they just want you to write it as
50 + 61  170 and then evaluate.
I find it puzzling why authors have to invent and come up with new language and new expressions of simple ageold problems.