1.8X+2.6Y = 100-27.6-2 = 70.4
X+Y=36
Solution: X=29 Y=7
Assuming that 27.6 yuan can be recovered, the equation is the same.
1.8X+2.6Y = 100-27.6 = 72.4
X+Y=36
Solution: X and Y are not integers, so they don't match.
On Monday morning, two students should be arranged to clean up the classroom.
From Monday to Friday, six students clean the classroom every day.
From Monday to Thursday, two students clean the school contract area every day.
Six students cleaned the contract area of the school on Friday.
Total: 2+6*5+2*4+6=46.