In township K, 1/5 of the housing units are equipped with cable television. If 1/10 of the housing units, including 1/3 of those that are equipped with cable television, are equipped with videocassette recorders, what fraction of the housing units have neither cable television nore videocassette recorders?
In township K, 1/5 of the housing units are equipped with cable television. If 1/10 of the housing units, including 1/3 of those that are equipped with cable television, are equipped with videocassette recorders, what fraction of the housing units have neither cable television nore videocassette recorders?
a.23/30 b.11/15 c.7/10 d.1/6 e.2/15
答案是A。1-（1/5）-（1/10）+1/15
为什么不是1-（1/5）-（1/10）+1/30？
including 1/3 of ....... cable television. NOT 1/3 of ........ videocassette recorders
including 1/3 of those ....
Here "those" modifies "households that are equipped with cable television" instead of "households equipped with recorders".
Did I understand correctly?
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发表于 2006-9-15 11:30:00
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