What is the size of an interior angle of a regular hexagon

Pls! does anybody know a shortcut for answering these types of questions in the future?

5/6+7/8what is the answer sealsdbdbshd

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers