Terry is n years old. Dennis is 2n + 5 years old. If Terry is 8 years old, how old is Dennis?
A 21
B 11
C 16
D 33
Terry is n years old. Dennis is 2n + 5 years old. If Terry is 8 years old, how old is Dennis?
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Terry is n years old. Dennis is 2n + 5 years old. If Terry is 8 years old, how old is Dennis?
A 21
B 11
C 16
D 33
To find Dennis’s age, we can substitute Terry’s age into the equation given for Dennis’s age.
1. Terry’s age (n): 8 years
2. Dennis’s age formula: 2n + 5
Now, plug in Terry’s age (n = 8) into the formula for Dennis:
[
Dennis’s , age = 2(8) + 5
]
[
= 16 + 5
]
[
= 21 , years
]
So, Dennis is 21 years old. The correct answer is A 21.