Teaching DSSSB PRT 2023 Mock Test Quantitative Aptitude Ratio and Proportion Simple Ratios

যদি 2a - 3b : 5a + 4b = 1 : 7 হয়, তাহলে (a - b) এর মান কত?

1
\(\dfrac{5}{9}\)
2
16 × ধ্রুবক
3
- \(\dfrac{25}{9}\)
4
0
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