1) 1600/80 + t = 6020 + t = 60t = 60 - 20t = 40
2) (2000 - 600) / t = 701400 / t = 70t = 1400 / 70t = 20
3) f - (1300 - 678) = 400f - 1300 + 678 = 400f - 622 = 400f = 400 + 622f = 1022
1) 1600/80 + t = 60
20 + t = 60
t = 60 - 20
t = 40
2) (2000 - 600) / t = 70
1400 / t = 70
t = 1400 / 70
t = 20
3) f - (1300 - 678) = 400
f - 1300 + 678 = 400
f - 622 = 400
f = 400 + 622
f = 1022