Answer:
Step-by-step explanation:
Let r represent red token,
Let o represent orange token,
Let y represent yellow token
Let g represent green token,
A red token is worth twice as much as an orange token. It means that
r = 2o
An orange token is worth 5 less a yellow token. It means that
o = y - 5
A yellow token is worth 15 less than a green token. It means that
y = g - 15
A green token is worth half as much as a blue token. It means that
g = b/2
a blue token is worth B. Therefore, the worth of a yellow token in terms of B would be
Substituting g = B/2 into y = g - 5, it becomes
y = B/2 - 15
