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students in Class B : x

students in Class A : (x + 18)

x + x + 18 = 2x + 18

(2x + 18)/2 = x + 9

(x + 18) – (x + 9) = 9 (1/8 of class A)

9 x 8 = 72 (students n Class A)

72 – 18 = 54 (students in Class B)

Note : Some if not most P4 students may face problem understanding algebra though.

 

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