1. The problem asks to solve questions 20 to 26, but per instructions, we will solve only the first question, number 20. 2. Question 20: Calculate $11 \times 27$. 3. Use the distributive property to simplify multiplication: $$11 \times 27 = 11 \times (20 + 7) = 11 \times 20 + 11 \times 7$$ 4. Calculate each term: $$11 \times 20 = 220$$ $$11 \times 7 = 77$$ 5. Add the results: $$220 + 77 = 297$$ 6. Therefore, the answer to question 20 is: $$11 \times 27 = 297$$