各位大虾请教一道英语数学题SAT if n is a two-digit number whose units digit is 4 times its tens

题目

各位大虾请教一道英语数学题SAT if n is a two-digit number whose units digit is 4 times its tens
if n is a two-digit number whose units digit is 4 times its tens digit,which of the following statements must be true?
A.n is a multiple of 4
B.n is a multiple of 7
C.10
D.n is greater than 40
E.20
SAT 学霸更好了.是2011年1月真题SECTION8 的第10题.

答案

题意是：如果n是各两位数,个位数字是十位数字的4倍,则下列正确的陈述是：
multiple是倍数的意思:
由题得：n是14或28
所以是7的倍数没错 选B