1x80, 2x40, 4x20, 5x16, 8x10
160
80
-1
-82
-20 and 80 -20*80=-1600 -20+80=60
-96
160
80
-1
I believe that means that you are supposed to multiply the numbers.
-82
80*1 40*2 20*4 10*8 5*16
They are 40 and 40
10 8
1680
-20 and 80 -20*80=-1600 -20+80=60
-1540