MCQ
If $10^{2 y}=25$ then $10^{-y}$ equals
- A$-\frac{1}{5}$
- B$\frac{1}{50}$
- C$\frac{1}{625}$
- ✓$\frac{1}{5}$
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If (2k - 1, k) is a solution of the equation 10x - 9y = 12, then k =