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1. $[4^{3} \times 5^{4}] \div 4^{5} = ?$

A. 29.0825

B. 30.0925

C. 35.6015

D. 39.0625

Solution:

\begin{aligned} \frac{4^{3} \times 5^{4}}{4^{5}} \\ = \frac{5^{4}}{4^{(5 - 3)}} \\ = \frac{5^{4}}{4^{2}} \\ = \frac{625}{16} \\ = 39.0625 \end{aligned}

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