Q1. So the only combinations that have the same colour are:

Red and Red, Yellow and Yellow (since blue and green only appear in one of the boxes)

red in box A = 2/6

red in box B = 3/6

probability of getting this is 2/6 x 3/6 = 6/36

yellow in box A = 1/6

yellow in box B = 2/6

probability of getting this is 1/6 x 2/6 = 2/36

Add these probabilities together:

6/36 + 2/36 = 8/36 = 4/18 = 2/9

and there's your answer!

Q2. You have already been given the answer! It's just simple substitution. If

V = 600 × (1.055)^n

where n is the number of years and they are asking for its value in 15 years...

C'mon you can do this