How do you solve these equations?

Hi guys! I'm pretty stupid, and again, I need help on some math problems! 1. Solve and check 1/2 (x) = 23/6 2. If a number is increased by 21, the result is 30. What is the number? 3. Find three consecutive numbers whose sum is 60. Can you guys please explain this stuff to me?? Sorry, thanks !! Love you all :D