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Answer» LET the number of STUDENTS be ‘x’. ⇒ Sum of AGES of all students/x = 8 ⇒ Sum of ages of all students = 8x Now, Sum of ages of teachers/12 = 45 ⇒ Sum of ages of teachers = 540 Average of all; ⇒ (Sum of ages of students + Sum of ages of teachers)/(x + 12) = 9 ⇒ 8x + 540 = 9x + 108 ⇒ 9x – 8x = 540 – 108 ⇒ x = 432 ∴ Total number of students = x = 432 |
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