If 102y = 25, then 10-y equals:  Choose the most appropriate option.
A) 3 B) 2 C) 6 D) 9 E) 1/5
102y = 25   (10y)2 = 52   10y = 5   1/10y = 1/5   10-y = 1/5   Answer :1/5
<result>E</result>
If 102y = 25, then 10-y equals: