To solve for \( c \) in the equation \( 3c = 12 \):
Part A:
- Divide both sides by 3: \[ c = \frac{12}{3} = 4 \]
So, \( c = 4 \).
Part B:
Now, to evaluate \( 5c \):
- Substitute \( c \) with 4: \[ 5c = 5 \times 4 = 20 \]
So, \( 5c = 20 \).
Final Answers
- Part A: \( c = 4 \)
- Part B: \( 5c = 20 \)