Let the number of the shirts of Lexon be A.
She ironed 1/4 or A over the weekend, so 3/4 of A are left to iron during the 5 weekdays.
So Lenox, each week day will iron:
[tex] \frac{ \frac{3}{4}A }{5} =\frac{3}{4}A* \frac{1}{5}= \frac{3}{20}A [/tex]
that is 3/20 of A, the total number of his shirts.
If she has 40 shirts, that is if A=40, on Thursday and Friday, she will iron:
[tex]\frac{3}{20}A+\frac{3}{20}A=\frac{6}{20}A=\frac{6}{20}*40=12[/tex] shirts.
Answer: 3/20 of the shirts ; 12 shirts