On her breakfast tray, Aunt Lily had a little vase of flowers--a mixture of primroses and celandines. She counted up the petals and found there were 39. "Oh, how lovely!" she said, "exactly my age; and the total number of flowers is exactly your age, Rose!"
How old is Rose?

Primroses have five petals on each flower.
Celandines have eight petals on each flower..

答案正确，谢谢翻译！我来用英语把做的过程说一遍。

The way to figure this out is to start at the end with 39 petals. and remember that the primroses must provide either 5 petals or 10 or 15 or 20 or 30-a multiple of 5. Now suppose there was only one celandine (8 petals); that would leave 31 petals (39-8=31). The rest can't be primroses, because 31 is not an exact multiple of 5. Suppose there were two celandines; that would make 16 petals, leaving 23. No good! Three celandines=24 petals, and 39-24=15 petals. Bingo! The answer must be 3 celandines and 3 primroses. Check: 3x8=24 and 3x5=15, and 24+15=39. So Rose is (3+3), or 6.

Is this clear enough?

又学英语又学数学。.

这是啥时候的贴啊。那时孩子还小，天天饶有兴趣地找些有趣的题目一起研究。现在已经基本不管了，所有功课都独立学习。特别是英语，从某种意义上说，是完全超过我的水平了。
看到这贴，回想当时，觉得作为妈妈，我还是很努力的。自己表扬自己，嘿嘿。.

我也在这里跟着大家学了很多。.