5^x – 5^(x-3) = (124)(5^y)
5^x - (5^x/5^3) = 124(5^y)
5^x(1 - 1/125) = 124(5^y)
5^x(124)/125=124(5^y)
5^x/125 = 5^y
5^x/5^3 = 5^y
5^x-3 = 5^y
x-3 = y
QUESTION 6 (NOV.24TH)
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Source: Beat The GMAT — Problem Solving |

















