railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Ratio and Proportion Fourth Proportional

যদি ‘x + 3’, 8 এবং 27-এর চতুর্থ সমানুপাতী ‘x - 3’ হয়, তাহলে ‘x’ এর ধনাত্মক মান কত?

1
15
2
12
3
18
4
21
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