3times as many green beads as red beads,

twice as many blue as green

150 beads total.

how many are green

33.3

Step-by-step explanation:

Let the number of green beads =G

Let the number of red beads =R

Let the number of blue beads =B

3*G=1R (1)

2B=G (2)

From equ(1), If G=2, R=6

From equ(2), 2B=2, B=1

Number of green beads =2/9 *150=33.3

b.-4 units

all you   do is count how many times you move