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A topic suitable for math diary.
[1] Today, my mother gave me 10 yuan to go grocery shopping. I bought two-tenths of a string of firecrackers, four lollipops, seven balloons, two-tenths of the money, and finally bought a comb, four-tenths of the money, two-tenths+one-tenth+two-tenths = nine-tenths. There is still 1 yuan left, and I have to pay it back to my mother.

When I got home, my mother ate a quarter of lollipops, my father ate a quarter of lollipops, I ate a quarter of lollipops, and there was one left. I gave it to Xiaodong's brother next door.