Given that number of working shifts = 3
Let number of loads of laundry that you can wash in 1 shift = x
Then number of loads of laundry that you can wash in 3 shift = 3x
Numerical value of the number of loads of laundry that you can wash in 1 shift is not given so it's not possible to convert "3x" into integer.
But whatever be the value say 5 loads of laundry is washed in 1 shift then the answer is given by 3x= 3*5= 15