dillonchr · December 1, 2021 05:32 · Dec 1, 2021
diff --git a/calculate-weight.js b/calculate-weight.js
@@ -0,0 +1,27 @@
+(function(weight) {
+    // how much water weighs per gallon
+    const WATER_WEIGHT_IN_POUNDS_PER_GALLON = 8.34;
+    // how much of the body is made of water
+    const WATER_PERCENTAGE_IN_BODY = 0.6;
+
+    function getGallonsOfWater(weight) {
+        return weight * WATER_PERCENTAGE_IN_BODY / WATER_WEIGHT_IN_POUNDS_PER_GALLON;
+    }
+
+    function getPoundsFromGallons(gallons) {
+        // since water is 60%, we need to figure out the other 40%
+        // so we just find one third of 60% (20%) and then double that
+        // to find 40% and add the two together to uncover what the original
+        // weight was
+        const oneThird = gallons / 3;
+        return (gallons + (oneThird * 2)) * WATER_WEIGHT_IN_POUNDS_PER_GALLON;
+    }
+
+    console.clear();
+    console.log({
+        weight,
+        gallons: getGallonsOfWater(weight),
+        andBack: getPoundsFromGallons(getGallonsOfWater(weight))
+    });
+}
+)(200);