Well basically, it’s kinda a struggle to understand this math your explaining: ( well, 3/6 = 8/?

16 will go where the question mark is located

So 3/6 = 8/16

Think of it like this: if you had three slices of pizza out of 6 total, then you had half the pizza. The same goes for if you had 8 slices out of 16 total

You can use the cross multiplication rule to find x
3/6 = 8/x
3*x = 6*8
3x = 48
3x/3 = 48/3
x = 16