Please help me solve this!

Question

Donald Duck wants to win the All Star Award for free throws. During the basketball tournament, he must make 90% of his free throw shots. He has already made 30 of his free throw shots and missed 2 of his free throw shots. How many of the remaing 18 attempts must he make in order to win the All Star Award for free throws?

Answer 1

he made 30, missed 2, 18 attempts left

he had 50 attempts to begin with

he must make 90% of the 50 attempts

90%*50=0.9*50=45 attempts must be made

he already made 30, so he must make 45-30=15 more of the remaining 18 to win the Award