Online Course Discussion Forum

Math Challenge I-C Spring

 
 
Picture of Wenli Guo
Math Challenge I-C Spring
by Wenli Guo - Sunday, March 5, 2023, 10:50 AM
 

In the number theory chapter I am having trouble with #6 and #9, for #6 I have turned the different numbers into 100A + 10B + A + 10C + D = 100B + 10A + B but don't know where to go from there. For #9 I don't know where to start.