The answer to question #2 is 20 cents.
This is because you need to find the price PER clementine, which means you have to divide 6 by 30. That equals .2, which in terms of money, is 20 cents.
The answer to #3 is 24 robots. He can make 1 robot with 1/6 of a bottle of glue, so that means he can make 6 robots per bottle of glue and he has 4 bottles. So 6 times 4 equals 24.