I am not exactly sure what the answer is but I remember when I was learning about it before. There is too much problem solving to remember all of them
It’s a 5/9 chance
Add all the marbles 3yellow+5red+1green (because you already took one green out)= 9 marbles and then you have 5 marbles so you have a 5 chance of picking a red marble out of 9 marbles
Well you do 228/12 to find your answer and that is 19 and to check you do 12*19=228
27 is 12% of 225
you can find this by dividing 27 by 0.12
I don't know about the first one but the second one you just subtract 5 from both sides of the equation:
3y = 14
Then you see, what times 3 equals 14...