Let the number of shirts she bought be x.
a)
95 >= 4(23) + 9x
b)
Solving the inequality, we have:
95 >= 92 + 9x
9x <= 95 - 92
9x <= 3
x <= 3 / 9
x <= 1/3
Thus, she can buy 1/3 of a shirt at most.
In conclusion, she did not bought any shirt due to lack of money.