中国建设银行
纸上写有若干个整数,它们的平均数为56,小明将其中的每个奇数乘以2,每个偶数乘以3.所得到的全部计算结果的平均值为l34,已知纸上所有奇数的和比所有偶数的和大180,那么纸上共写有几个数?( )
A.12
B.15
C.16
D.18
设偶数和为a.共有n个数.由题意可得.
解得,n=15,应选择B。
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