Eight hundred tickets are sold for a play. thirty-five percent of those tickets were sold in advance. which equation can be used to find the number of tickets sold in advance?

Sherrie is baking a pie for her family. she leaves the room and comes back to 35% of the pie having been eaten before she can put the topping on. how much 1 square inch strips of dough will she need for the top, now that a portion is missing? round your answer to the nearest while nimber.