Seeking mathematical answers to the connection of junior high school textbooks

1, Huanhuan 135, Lele 180 was originally 4/7, but later Lele was 4/9, 4/7-4/9=8/63. Divide 40 by 8/63 to get the total of 3 15, and then according to the ratio of 3:4.

2. If you type 6000 words in 50 minutes, you will type 5000 words, but if you type 4800 words * *, which is two minutes less than the text, you will type 200 words for two minutes, 100 words for one minute, then you will type 120 words for one minute, and 6000 is divided by 6500.

3. No graph ...

4. 192 divided by 32 equals 6, so the small wheel turns 6 times and the large wheel turns 1 time, while the small wheel turns 600 times per minute, the large wheel turns 100 times per minute and turns 50 times every 30 seconds.

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