[求助]两道PRINCETON 数学题

nicolechan28

1 Mysoon collects glass ornaments. Ten more than 1/6 of the ornaments in her collection are hand made, and 1/2 of the handmade ornaments are antiques. If 1/9 of the ornaments in her collection are handmade antiques, how many ornaments are in her collections?

answer:180 (请问黄色部分什么意思？？)

2 A racing dog ran 40 races before retiring at age 4. How many races did he win?

(1) He won his first 30 races, all run before the age of 4.

(2) He lost 25 percent of his races before age 4, won none of the his last 10 races, and won 75 percent of his races overall.

answer2) (我觉得1也对啊。。。)

困惑中。。。

nicolechan28

不明白啊～请NN指点迷津～～

marvelvaliant

1 Mysoon collects glass ornaments. Ten more than 1/6 of the ornaments in her collection are hand made, and 1/2 of the handmade ornaments are antiques. If 1/9 of the ornaments in her collection are handmade antiques, how many ornaments are in her collections?

answer:180 (请问黄色部分什么意思？？)

楼主试着画一下列联表，参照以前的选课或者买报纸杂志那题，就可以列出方程了，黄色是10+1/6*藏品总数。

2 A racing dog ran 40 races before retiring at age 4. How many races did he win?

(1) He won his first 30 races, all run before the age of 4.

(2) He lost 25 percent of his races before age 4, won none of the his last 10 races, and won 75 percent of his races overall.

answer2) (我觉得1也对啊。。。)

困惑中。。。条件不知道后10次的胜率情况，所以不对。

nicolechan28

明白了，thx a million~~