Verified Answer :

Neuron

Archy:  15 gallons ... $23.85
               1 gallon ...$ x = ?

x 15 = 1 23.85    /15
x = 23.85 / 15
x = $1.59 per gallon

Joe:  16 gallons ... $24.48
           1 gallon ... $ y = ?

y * 16 = 1 * 24.48    /16
y = 24.48 / 16
y = $1.53 per gallon

Result: Joe paid less per gallon.

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