The formula 35 divided by 8 is equal to 4. 3 can solve many problems in life. Please write a mathematical problem solved by this formula

Each pen is 8 yuan. Xiao Ming bought 4 pens. He paid the clerk 35 yuan. How much should he get back?
Each pen is 8 yuan. Xiao Ming has 35 yuan. How many pens can he buy? How many yuan is left?

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5. A simple method to calculate 15 × (4 + 20)=
6. 25 1 / 3 - [(20-15 3 / 4) + (13 3 / 4-17)]
7. The process of finding [6 and 5 / 3 - (8.5-1 / 3) △ 3.5] × (2 and 18 / 5 + 12 / 11)
8. 5 / 9 + 3 / 11 + 4 / 9 + 8 / 11 + 7 / 18 △ 4 + 3 / 4 × 7 / 18 (1 / 4-1 / 6) × 12 5 of 9 + 3 of 11 + 4 of 9 + 8 of 11 + 7 of 18 △ 4 + 3 of 4 × 7 of 18 (1 of 4-1 of 6) × 12 important process
9. 4 + 4 + 1 / 2 * 6 / 7 / 9 / 5 of 14 -- (1 + 5 / 6 + 1 + 11 / 18)
10. 1 out of 18 + (2 out of 3 + 4 out of 21) = = = How much is it?
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