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IQAir, a Switzerland-based climate group has released World Air Quality Report. Here are the ten cities with the worst air quality indicators, according to IQAir:
Delhi, India
Lahore, Pakistan
Chengdu, China
Mumbai, India
Karachi, Pakistan
Kolkata, India
Sofia, Bulgaria
Dhaka, Bangladesh
Belgrade, Serbia
Jakarta, Indonesia
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A certain number of students from school X appeared in an examination and 30% students failed. 150% more students than those from school X, appeared in ...
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If x – 1/x = 9, then x3 – 1/x3 is:
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