Carlos is painting a forest landscape. halfway through the painting, carlos has used 5/6 tube of brown paint and 2/3 tube of green paint. if he plans to use the same amounts of each color as he did in the first half to finish the second half of the painting, how many tubes of paint will carlos use all together?

a. 3
b. 2 1/3
c. 1 3/4
d. 1 1/2
e. 1/6