Michael started with 30 baseball cards and gave away x number of cards. johnny started with 40 baseball cards and gave away twice as many as michael did. how many cards did michael give away if they had the same number of cards left?

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.