Let's assume the cost 20 years ago equals x
3x - 3 = 75
or
x = 75 / 3 + 3
Answer:
85 is the answer because it goes down by 3.5.
Step-by-step explanation:
100-.5=99.5, 99.5-1=98.5, 98.5-1.5=97, 97-2=95, 95-2.5=92.5, 92.5- 3= 89.5, 89.5-3.5=85, then 85-4=81, then so on.
6/15=2/c
Cross multiplications.
15*2=30
6*c=6c
6c=30
divide.
c=5