There were 14 brownies on two plates. Benjy took 2 brownies off the first plate. Then there were only 4 brownies on that plate. How many brownies were on the second plate?

When Carl put the number 4 into a number machine, out came the number 9. He tried it again with the number 7. The number 12 came out that time. Carl tried again with a new number and the number 15 came out. What number had Carl put into the machine?

Ernie and Bert went trick-or-treating. They counted their candy when they were done. Ernie said, "I have double the candy bars you have." Bert said, "I only have 6 candy bars." How many candy bars did Ernie and Bert have together?

Jack has 2 marbles. Derek has 6 more marbles than Jack. Ralph counted his marbles and said, "I have 3 fewer marbles than the two of you have together." How many marbles do the boys have altogether?

One tootsie roll and two lollipops cost 14 cents. One tootsie roll and one lollipop cost 10 cents. How much does a tootsie roll cost?