1.

1). 4322). 5403). 4084). 416

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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