Explanation: I got this answer from multiplying each equation and listing them above. Then I sorted them least to greatest by the smallest number, to the biggest number.
I'll start by expanding everything, and 10^(x) means we move the decimal x places to the right. If we move the decimal to the right but there's no number there, that number is 0. The populations are as follows (in the order in the graph) - 127,180,000 200,000,000 80,619,000 63,708,000 173,615,000 152,510,000
The first difference is the number of digits. The more, the better. The two that stand out at the bottom are Germany and the UK. Next, we look at the leftmost number. Since 6<8, Germany's population > UK's population. All other countries are greater than Germany. Next, we look at the next smallest amount of digits, which is every other country. We look at the first number, which gives us Japan, Nigeria and Bangladesh. Next, we look at the second number, and since 2<5<7, Japan is smaller than Bangladesh and Nigeria is bigger than Bangladesh. Our current list is as follows: United Kingdom (UK), Germany, Japan, Bangladesh, Nigeria. Since Brazil has been proven to be greater than the rest (as it has more digits and 2>1), our list is now United Kingdom (UK), Germany, Japan, Bangladesh, Nigeria, Brazil
