Rohan and Dravid were preparing to have a water balloon fight. "No Fair" cried Rohan, "You have 3 times as many as I do!" Dravid said "Fine!" and gave Rohan 10 more balloons. "Still not fair!" argued Rohan, "You still have twice as many as I do."
How many more balloons must Dravid give Rohan for them to have the same number?