Bab 549: Chapter 549 "Crystal Spirit Stone"

"So first you bring the lamb to the other side. You go back to the starting point, grab either tiger or grass it doesn't matter. Bring it to the other side, put it down, now you pick up the lamb again and bring it to the starting point. Pick the rest you haven't bring, left the lamb at the starting point first. After you deliver tiger and grass to the other side, only then you bring back the lamb" 

Li Shi Ying explained her answer which was a very long process but when they listened carefully, what she said made sense since tiger won't eat grass so leaving those two alone won't be a problem. 

They just need to bring the lamb for a few times crossing the river! 

"Oh I didn't think like that…God it's actually easy" Shu Chen sigh regretting the fact that his brain didn't think that far. He only thought of how to get those three to the other side without having to do the work twice that's why he could find an answer.