David recieved $50 for working at his dads store. he spent $20 at the movies, and $10 buying a comic books. after buying $5 worth of candy, he saved the rest. what was the ratio of the amount of david spent to the amount that david saved?

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)