32.6M/0.131=248.85M would be the population. It’s just “13.1% of x is 32.6M”.
<u>For W, </u><u>W = 28B.</u>
Given that one concrete block is 28 pounds, and that B is the number of blocks, we can multiply both values to get the amount of pounds, or weight, of the quantity of B blocks. So <em>W = 28B.</em>
<u>For B, </u><u>B = W ÷ 28</u>
Now that we know the equation for the weight, W = 28B, we can divide both sides by 28 to isolate the variable, B. The equation now becomes <em>B = W ÷ 28. </em>