Explanation:
Let,
No. of girls = x
No. of boys = 120 + x
=> 120 + x + x = 980
=> 120 + 2x = 980
=> 2x = 980 - 120
=> 2x = 860
=> x = 860/2
=> x = 430
=> 120 + x = 120 + 430 = 550
Hence,
No. of girls = 430
No. of boys = 550
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