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Option 2 : 907
Calculation:
Total percentage of qualified students from the Districts A, C and F = (15% + 28% + 5%)
⇒ 48%
The average number of qualified students from the Districts A, C and F = (48% of 68000)/3
⇒ (48/100 × 68000)/3
⇒ 32640/3
⇒ 10880
Total percentage of qualified students from the Districts B, D and E = (25% + 18% + 9%)
⇒ 52%
The average number of qualified students from the Districts B, D and E = (52% of 68000)/3
⇒ (52/100 × 68000)/3
⇒ 35360/3
⇒ 11786.66 ~ 11787
Required difference = (11787 – 10880)
⇒ 907
∴ The required difference is 907
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