railway DFCCIL Executive 2025 Mock Test Quantitative Aptitude Elementary Statistics

यदि \(\frac{11a}{10}, \frac{6a}{5}, \frac{9a}{5}, \frac{20a}{9}, \frac{12a}{5}\) की माध्यिका 9 है तो 'a' का मान ज्ञात कीजिए।

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