题干
阅读回答问题。
Li Ming: I have 13 pencils, 35 crayons and 8 rulers.
Steven: I have 21 pencils, 15 pens and 10 rulers.
Mary: I have 19 pencils, 40 crayons and 12 books.
Tom: I have 25 erasers, 72 crayons and 23 rulers.
