A total of *** 12 sheets of paper were distributed to four students, each with three sheets. The other two students * * * have six pieces of paper, that is to say, six pieces of paper 9 yuan, one piece of paper 1.5 yuan, Xiaohua bought four pieces of paper by subtracting his own three pieces, so Xiaohua got 6 yuan; 9 yuan minus Xiaohua's 6 yuan and Xiaoying's 3 yuan.