Junior high school mathematics is calculation.

There are always x pages, and I read one seventh the next day.

X/5+ax/7=x-303, which is simplified to (28-5a)x= 10605, so x= 10605/(28-5a), because X is a positive integer, so 28-5a must be1.

Put on your armor and walk for x minutes.

When the total distance is 1, the speed of A is 1/50, and the speed of B is 1/40. Now, if B takes a two-minute break, it is equivalent to walking for one minute 1/60, that is, the speed is 1/60, so it is X/50+X/.

Open the math book.

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