A Real Brain Bender

Can you sift data from a small clue your opponent let slip? Singapore TV host Kenneth Kong posted a puzzle at Facebook. Apparently, he and his wife have been arguing over it. Now, countless workplaces are losing man-hours while people try to figure it out on their own, or are else trying to explain it to each other. Kong says it’s a Sec 3 question, passed to him by a P5 student. Can someone familiar with the Singapore education system explain what that means?   

I don’t think there’s any math involved, technically, but there are numbers, so if you give up and just want to know, the answer is here. The explanation is pretty easy to understand, and it makes me glad I didn’t tackle it. After all this, I doubt Cheryl will be receiving any birthday gifts. -via Uproxx