Answers

2016-05-09T14:13:15+05:30
If  n by 9 is =7 (remainder)
so, 3n - 9 =[(3*n)-9]
                  n= 9+7=16              i.e. n=16
                   [(3*16)-9]
                   [(48)-9]
                   [48-9]=39
so,3n-9=39
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2016-05-11T15:00:44+05:30
N÷9=7
n=9×7
=63
if n is 63 then
3n-9÷9=(3×63-9)÷9
=(189-9)÷9
=180÷9
=20 and 0 remainder


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