let number of boys be 5x and girls be 4x.
∴ according to the question
⇒ 5x = 4x + 9
⇒ 5x-4x = 9
⇒ x = 9
∴ number of boys = 5x = 5 × 9 = 45
⇒ And number of girls = 4x = 4 × 9 = 36
⇒ Hence, it is not true.
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