趁两高手在,再请教两个题目...最要命的是我连题目都没看懂

１.Of the three-digit integers greater than 700,how many have two digits that are equal to each other and the remaining digit different from the other two?
a.90
b.82
c.80
d.45
e.35

2.If s and t are positie integers such that s/t=64.12,which of the following could be the remainder when s is divided by t?
a.2
b.4
c.8
d.20
e.45

thanks again