You have to add them the find the reciprocal and divided to find the width then turn it to a fraction them multiply and subtract again and find your answer
<span>one hundred eighty billion, nine hundred million, two hundred thirty-six thousand, eight hundred twenty-one</span>
3.2 gallons
You see what you do is you divide 120 by 37.5 and you will get the number of gallons
Those are vertical angles
