Question 868889
c=p+f+160,
f=1.25p,

0c+1.25p-1f=0
c+p+f=1600
c-p-f=160
c = 880,   f = 400,   p = 320
0x, 1.25y, -1z, 0
1x, 1y,     1z,  1600
1x,-1y    ,-1z,  160

0, 1.25, -1, 0
1, 1, 1, 1600
1,-1,-1,160
*[invoke cramers_rule_3x3 0, 1.25, -1, 0, 1, 1, 1, 1600, 1,-1,-1,160]