Someone please explain!

Answer:
Let the number of beads = x
Sum of the ratio = 11
a) fraction of yellow beads :
[tex]\frac{11}{15} \ of \ x \\[/tex]
b) given there are 75 beads , x =75
# of yellow beads =
[tex]\frac{11}{15}*75 = 55\\[/tex]
#of green beads =
[tex]\frac{4}{15} *75 = 20[/tex]
Number of green beads = 20
c) After adding more beads.
Given yellow beads = 3 times as many green = 3×20 = 60
Gabby added more yellow beads.