[求助]GWD2----math32?看看我的方法对马

Q32:

What is the remainder when the two digit, positive integer x is divided by 3?

(1)     The sum of the digits of x is 5.

(2)     The remainder when x is divided by 9 is 5.

（1）10m+n         m+n=5  n=5-m  代入9m+5

(2)9k+5

除3的话都是余2