X times as many as... 这样的句型不理解，哪位给解释下呀

Atir

这是一道OG上的原题，句子没看懂就做错了。蓝色的部分，到底说谁是谁的三倍呢？

52. In a certain population, there are 3 times as many
people aged 21 or under as there are people over 21.
The ratio of those 21 or under to the total population is
(A) 1 to 2
(B) 1 to 3
(C) 1 to 4
(D) 2 to 3
(E) 3 to 4
Algebra Applied problems
Let x represent the people over 21. Th en 3x
represents the number of people 21 or under,
and x + 3x = 4x represents the total population.
Th us, the ratio of those 21 or under to the total
population is
3
4
3
4
x
x
= , or 3 to 4.

heyifeifei

你这么倒过来看就理解了：there are ppl aged 21 or under [3 times as many as ppl over 21]
<=21的人数是＞21的三倍．

MrSoul

aged 21 or under  =3x，
over 21 =x
是这样滴~ OG解释得蛮清楚的

Atir

你这么倒过来看就理解了：there are ppl aged 21 or under [3 times as many as ppl over 21]
<=21的人数是＞21的三倍．

-- by 会员 heyifeifei (2011/7/2 23:07:59)

多谢！

Atir

其实还是有点懵懵懂懂，不过就这么死记吧