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

If 2a - 3b : 5a + 4b = 1 : 7, then (a - b) is equal to

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