4<1+n/7
4 < 1 + n /7 Multiply both sides by 7
28 < 7 + n Subtract 7 to both sides
28 - 7 < 7 + n - 7
21 < n
This is equivalent of :
n > 21
28 < 7 + n Subtract 7 to both sides
28 - 7 < 7 + n - 7
21 < n
This is equivalent of :
n > 21