Task 1. Dragan bought 5 tokens for shooting with an air gun. For each accurate guess, he gets 2 more tokens. How many times did he hit the target if he shot a total of 17 times.
Solution. Dragan has 5 tokens, and to play 17 times he used 17 tokens. This means he earned $17-5=12$ new tokens. For each hit, he gets two tokens, which means he hit the target exactly $12: 2=6$ times.