Math with a boy and a girl
Find the result GIRL - BOY = ?
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Use variables instead of pictures
Let girl = g
Let boy = b
2g - 4/b = 10 => (*b) => 2gb - 4 = 10b => 2gb - 10b = 4
2g + 2/b = 4 => (*b) => 2gb + 2 = 4b => 2gb - 4b = - 2
2gb = 4 + 10b
=> 4 + 10b - 4b = -2 => 6b = -6 => b = -1 (Boy = -1)
now 2g + 4 = 10 => 2g = 6 => g = 3 (Girl = 3)
in total the reuslt 3 - (-1) = 4
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