SOLUTION: Ingrid"s age is 5 years less than 2 times Danika"s age. If Ingrid is 25 years old, which equationcan be used to determine Danika"s age?

Algebra ->  Problems-with-consecutive-odd-even-integers -> SOLUTION: Ingrid"s age is 5 years less than 2 times Danika"s age. If Ingrid is 25 years old, which equationcan be used to determine Danika"s age?      Log On


   

Question 133393: Ingrid"s age is 5 years less than 2 times Danika"s age. If Ingrid is 25 years old, which equationcan be used to determine Danika"s age?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Let I = Ingrid's age, let D = Danika's age
;
Write an equation for the statement
"Ingrid"s age is 5 years less than 2 times Danika"s age."
I = 2D - 5
;
It says:
If Ingrid is 25 years old," Therefore:
I = 25
:
which equation can be used to determine Danika"s age?
:
Just substitute 25 for I in the first equation and solve for D
25 = 2D - 5
25 + 5 = 2D
30 = 2D
D = 15