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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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