railway RRB Group D Mock Test Series 2024-25 Quantitative Aptitude Percentage

A এর 80% এর 45% এবং B এর 40% এর 30% অনুপাত 15 ∶ 4. A এবং B এর গড় 67.5 হলে A - B এর মান কত?

1
10
2
18
3
12
4
15
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