Question

Aflati nr necunoscute: p-(30+40)=10 30-(c-40)=10 (a+40)-30=10 90-(□+30)=50 □-(80-50)=40

Answer 1

p-(30+40)=10

p-70=10

p=10+70

p=80

30-(c-40)=10

c-40=30-10

c-40=20

c=20+40

c=60

(a+40)-30=10

a+40=10+30

a+40=40

a=40-40

a=0

90-(a+30)=50

a+30=90-50

a+30=40

a=40-30

a=10

a-(80-50)=40

a-30=40

a=40+30

a=70