单选题If 4c＝d and 0.4f＝c, what is the value of d when f＝40?A80B64C40D32E25
单选题
If 4c＝d and 0.4f＝c, what is the value of d when f＝40?
A
80
B
64
C
40
D
32
E
25
参考解析
解析：
f=40时，c=0.4c=0.4×40=16，又因为d=4c，所以d=4×16=64。
f=40时，c=0.4c=0.4×40=16，又因为d=4c，所以d=4×16=64。
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