use algebra in combination with plug-in/analyze strategy here
st(1) implies x/100=
integer+30/100. Hence,
integer=(x-30)/100. Analyze x, it can be >=30 and should return
integer for (x-30)/100. All possible values should contain digit 3 in tens'
st(2) implies x/110=
integer+30/110. Hence,
integer=(x-30)/110. Analyze x, it can be >=30 and should return
integer for (x-30)/110. Possible x=140 and x=250 with digits 4 and 5 in tens'
Answer
A
fangtray wrote:What is the tens digit of a positive integer x?
1) x divided by 100 has a remainder of 30
2) x divided by 110 has a remainder of 30
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