13 boxes, in last box 10 kernels.
Step-by-step explanation:
There are 1450 kernels in a pound.
Each box hold 120 popped kernels
Let 'n' number of boxes have been filled with 1450 kernels and 120 popped kernels in each box.
Therefore, equation will be 120x = 1450
x =
= boxes
By this answer we understand that 12 boxes have been filled and part of the last box was filled.
Now number of popcorn kernels in 12 boxes = 12 × 120 = 1440
Remaining kernels for the last box = 1450 - 1440 = 10 kernels
Therefore, 13 boxes required and 13th box will have 10 kernels.