Help me ! not really -.-

If 20% of a number is 35, what is 50% of that number?

Which letters from the table represent like terms? a and b b and c a and d b and d

Fracisco's game involves 3 green, 2 yellow, 4 red, and 3 black marbles. if he randomly draws three marbles from the bag, without replacement, what is the probability that he will draw yellow, and then red, and then black? a)1/192 b)1/72 c)3/220 d)1/55