Question 190185
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There are certain ways to know which is better.


Brand x = 4 oz/$1.40 ; Brand y = 6 oz/$2.16


In Brand x, divide both numerator and denominator by 4 to get a price for 1 oz:
{{{(cross(4)oz*1/cross(4))/(cross(1.40)0.35/cross(4))}}}
<font color=blue>1 oz/$0.35</font>


In Brand y divide both num. and den. by 6 to get a price for 1 oz:
{{{(cross(6)oz*1/cross(6))/(cross(2.16)0.36/cross(6))}}}
<font color=blue>1 oz/$0.36</font>



You can see Brand x is better. You can hardly see the difference for smaller amount, buy try to fill 1 gallon tank.


We know 1 gal = 128oz


Brand x needs: {{{128/4=32oz}}} to fill 1 gal tank, and cost you, {{{1.40*32}}}=<font color=blue>$44.80</font>


Brand y needs: {{{128/6=21.33333oz}}} to fill 1 gal tank, and cost you, {{{2.16*21.33333}}}=<font color=blue>$46.08</font>



It clearly shows, the choice is <font color=blue>Brand x</font> to fill 1 gal tank.



Thank you,
Jojo</font>