One gallon weighs 8.5 pounds. In 4 1/2 there are 4 gallons so we’re need to figure out how much 4 gallons weigh. To do this multiply the weight of one gallon by the number of gallons.
4 x 8.5 = 34
So we know that 4 gallons is 34 pounds
Now we still have half a pound we need to find the weight of. To find the weight of half a pound divide the weight of one gallon by 2.
8.5 divided by 2 = 4.25
Now we add the 4 pounds and the 1/2 to get the weight of them.
34 + 4.25 = 38.25
So the answer is 38.25 pounds
If you need more of an explanation let me know I can try to explain better :)
This is a special right triangle with angle measures 90° 45° 45° and the side lengths for the ones that sees 45° = a and the one that sees 90° = a√2 (hypotenuse)
