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Option 3 : 594

From the pie chart, 

⇒ Number of teacher of chemistry = 24% of total number of teacher  

⇒ (24/100) × 1650 = 396 

⇒ NUmber of teacher of biology = 12% of total number of teacher 

⇒ (12/100) × 1650 = 198 

⇒ Total number of teacher teaching chemistry and biology = 396 + 198 = 594 

∴ the total number of teachers teaching chemistry and biology is 594 

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