1. **State the problem:** Calculate the sum of the numbers 20, 20, 20, and 7. 2. **Formula used:** To find the sum of several numbers, use the addition formula: $$\text{Sum} = a + b + c + d$$ where $a$, $b$, $c$, and $d$ are the numbers to add. 3. **Apply the formula:** Substitute the given numbers: $$\text{Sum} = 20 + 20 + 20 + 7$$ 4. **Perform the addition step-by-step:** $$20 + 20 = 40$$ $$40 + 20 = 60$$ $$60 + 7 = 67$$ 5. **Final answer:** $$\boxed{67}$$ The total sum of 20, 20, 20, and 7 is 67.