Which is true of the infinite solutions of the inequality x < 0

Student price tickets to a movie are $1 and non student tickets are $2. 350 tickets are sold and the total amount made is $450. how many non student tickets were sold ? a) 100 b) 150 c) 200 d)250

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?