1 Sally had a third again as many as David,who had a third as many again as Rrancis. Altogether they had 111.How many did David have?
A 27 B 32 C 36 D 48
答案是C 为什么？
（小学数学题都不会做了）

2 BONA FIDE is to genuine as DE FACTO is to ___.
A  together B actual  C reason  D assumed

答案是B

x=(1+1/3)y
y=(1+1/3)z
x+y+z=111
联解 y=36