其它
Pip swam $$3$$ back and forth in the lane for a total of $$156$$ meters, how long is the lane in this pool? 
Overseas Competition->Knowledge Point->Number Theory Modules->Factors and Multiples->Common Factors and Common Multiples->Short Division
one back and forth $$156\div3=52$$meters  length of the lane$$52\div2=26$$meters 