I am a gcse math student. My teacher set me this math homework without explaining properly. I have search this internet for explanation of this question but to no avail
You don't need to know the exact question.. There isn't any point of learning if you can't do a variety of questions, all similarly related still but, if you're just finding the exact question it's not learning, it's copying and that will all catch up to you when you get into more complicated and harder stuff. And that's not just in maths