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If the total sum of 40 bills (either 2-dollar bills or 4-dollar bills) is $90, what is the probability that a 4-dollar bill is selected out of these bills?
Give your answer as a fraction.
Give your answer as a fraction.
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· 相关考点
3.3.2 解二元一次方程组与相关应用题
3.3.2 解二元一次方程组与相关应用题
以上解析由 考满分老师提供。
