Answer:
15 makes the equation true
Step-by-step explanation:
Data :{2.5.15.50}
Equation : 
We are supposed to find which value from the data satisfies the given equation
So, Substitute n = 2

Substitute n = 5

Substitute n = 15

Substitute n = 50

Hence 15 makes the equation true
So, there are two equations.
5a + 3c = 30
a + c = 8, therefore, a = 8 - c
5a + 3c = 30
5(8 - c) + 3c = 30
40 - 5c + 3c = 30
-2c = -10
c = 5 , So a = 3
The answer is B.
There is more than one term