Final answer:
Cathy is 5 decades old because there are 10 years in a decade and 50 divided by 10 equals 5.
Step-by-step explanation:
To calculate how many decades old Cathy is, we must understand that a decade consists of 10 years. To find out how many decades are in 50 years, we divide Cathy's age by the number of years in a decade.
Cathy is 50 years old. This means:
- 50 years ÷ 10 years per decade = 5 decades.
Therefore, Cathy is 5 decades old.
To find out how many decades old Cathy is, we need to divide her age by 10. Cathy is 50 years old, so when we divide 50 by 10, we get 5. Therefore, Cathy is 5 decades old.