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Option 2 : 75 : 44
Calculation:
The total number of candidates enrolled in institutes Q, R and S together = (30% + 12% + 18%) of 7500
⇒ 60% of 7500
⇒ 4500
The total number of candidates passed from the institutes Q, R and S together = (24% + 18% + 24%) of 4000
⇒ 66% of 4000
⇒ 2640
Required ratio = 4500 : 2640
⇒ 225 : 132
⇒ 75 : 44
⇒ Required ratio is 75 : 44
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