A bag contains blue marbles and red marbles, 56 in total. The number of blue marbles is 8 more than 2 times the number of red marbles. How many blue marbles are there?

40

Step-by-step explanation:

b + r = 56 (1)

b = 2r + 8 (2)

(1) r = 56 - b

(2) b = 2(56 - b) + 8

b = 112 - 2b + 8

3b = 120

b = 120÷3

b = 40

is this a multiple choice question?

if so it's a and c

2 over 5

step-by-step explanation:

the 2: 3 ratio is the length of the ac segment to the cb segment total length. this implies that the ratio between segment ac length and segment ab length is 2: 5. point c is 2/5 from a to b, so the required fraction is 2/5.