Jordan found one seashell at the beach on Monday. She found 2 seashells the next day. If Jordan finds 2 seashells every day after that, how many days until Jordan has 21 seashells altogether?

Amy, Bart, Connor, and Doug raced to the oak tree. It took Amy 16 seconds to get there. It took Bart 4 seconds less than Amy. Connor 3 seconds less than Bart. Doug was the slowest. It took him twice as long as Connor to get to the tree. How many seconds did it take Doug to reach the tree?

Juan is thinking of a number. When you add 5 to his number you get 14. What do you get if you subtract 5 from Juan’s number?

There are 18 students in Gavin’s class. There are 4 more boys than girls. How many boys are in Gavin’s class?

Rick played a number-guessing game with Nick. When Nick said 9, Rick said 18. When Nick said 3, Rick said 12. When Nick said 1, Rick said 10. What was Rick's number?