If $$10^{}\text{th}$$June is Sunday, what day of the week is $$1$$\textsuperscript{st} June? 
Overseas Competition->Knowledge Point->Word Problem Modules->Periodic Problems->Periodic Problems of Time
We can count backward by days or by weeks. There are 9 days in between, that means 1 week and 2 days. Then count a few days back to find that $$1$$\textsuperscript{st} June is a Friday. 