1600:80+t=60 (2000-600):f=70 d-(1300-678)=400

Question

1600:80+t=60

(2000-600):f=70

d-(1300-678)=400

Answer 1

1. 1600:80+t=60

20+t=60

t=60-20

t=40

2. (2000-600):f=70

1400:f=70

f=1400:70

f=20

3. d-(1300-678)=400

d-622=400

d=400+622

d=1022

 

Answer 2

1600/800+t=60

2+t=60

t=60-2

t=58

 

(2000-600)/f=70

1400/f=70

f=1400/70

f=20

 

в-(1300-678)=400

в-622=400

в=400+622

в=1022