Answer:
Option D - 30 years
Step-by-step explanation:
Given : Michelle is three times as old as Fiona. Fiona is twice as old as Madeline. Madeline is five years old.
To find : How old is Michelle?
Solution :
Let the Michelle is x years old.
The Fiona is y years old.
The Madeline is z years old.
According to question,
Madeline is five years old.
i.e. z=5
Fiona is twice as old as Madeline.
i.e. [tex]y=2z[/tex]
[tex]y=2(5)[/tex]
[tex]y=10[/tex]
Fiona is 10 years old.
Michelle is three times as old as Fiona.
i.e. [tex]x=3y[/tex]
[tex]x=3(10)[/tex]
[tex]x=30[/tex]
Michelle is 30 years old.
Therefore, Option D - 30 years old is correct.
