数学解题 OG 2

acein

13. If s and t are positive 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


怎么办呢，这么多不会的

葛佳

key E

x= ny + reminder

so x / y = y + reminder / y

so reminder / y = 0.12

100r = 12 t

100r = 12 y..

y = 25/3 r