Try the following GMAT Quantitative Reasoning question on manipulating exponent expressions.
Question 65:
Suppose that $4^{x_1}=5$, $5^{x_2}=6$, $6^{x_3}=7$, $\ldots$ , $127^{x_{124}} = 128$. What is $x_1 x_2 \cdots x_{124}$ ?
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$\quad 2$
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$\quad \dfrac{5}{2}$
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$\quad 3$
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$\quad \dfrac{7}{2}$
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$\quad 4$
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