Simon had a total of 90 blue, green and red marble. After he gave away 10 blue marbles, the ratio of the number of blue green and red marbles became 1 : 1 : 2
a. how many blue marbles does Simon have at first

b. how many green marbles doe Simon have at first

c. how many red marbles does Simon have at first

d. what is the ratio of the number of blue green, and red at first?