What transforms carbon into diamonds

Ben wants to play a carnival game that costs $2. in his pocket he has 5 red tickets worth 35 cents each, and 15 blue tickets worth 10 cents each. which of the following systems of inequalities correctly represents the constraints on the variables in this problem? let represent the red tickets and b represent the blue tickets.

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

How many grams the dog will eat in 3 days?