11) At the Writing Factory, the assembly line produces 225 pencils in a batch. The pencils are packaged in boxes with 20 each. If 3 batches are made in one day, how many pencils will be leftover at the end of it?

To find out how many pencils will be leftover at the end of the day, we can follow these steps: 1. **Calculate the total number of pencils produced in one day:** \[ \text{Total pencils} = \text{pencils per batch} \times \text{number of batches} \] \[ \text{Total pencils} = 225 \times 3 = 675 \] 2. **Determine how many boxes can be filled with the total number of pencils:** \[ \text{Boxes filled} = \frac{\text{Total pencils}}{\text{pencils per box}} = \frac{675}{20} \] Performing the division: \[ \text{Boxes filled} = 33.75 \] Since we can only fill whole boxes, we can fill 33 boxes completely. 3. **Calculate the total number of pencils used in the filled boxes:** \[ \text{Pencils used} = \text{Boxes filled} \times \text{pencils per box} = 33 \times 20 = 660 \] 4. **Calculate the number of leftover pencils:** \[ \text{Leftover pencils} = \text{Total pencils} - \text{Pencils used} = 675 - 660 = 15 \] Therefore, the number of pencils leftover at the end of the day is **15**.