Answer:
Therefore the age of Susan is 19.4 years.
Step-by-step explanation:
Given, the age of Bob is 4 times greater than the age of Susan.
It means Bob's age = 4×Susan's age........(1)
Again, the age of Dakota is 4 less than Susan.
It means Susan's age - 4=Dakota's age.......(2)
In (1) and (2)only Susan's age is common.
So, Let the age of Susan be x.
From (1) we get
Bob's age = 4×x = 4x [ Since Susan's age= x]
From (2) we get
Dakota's age= x-4
Again given that the sum of all three age is 93.
It means
Bob's age+Susan's age+Dakota's age= 93
Putting the age of the three
⇒4x+x+(x-4)=93
⇒4x+x+x-4=93
⇒5x=93+4
⇒5x=97
⇒x = 19.4
Therefore the age of Susan is 19.4 years.