Question

15+b·4=35
b·4=35-

3·i+9=30

5·n-5=40

Answer 1

15+b×4=35

b×4=35-15

b×4=20

b=20:4

b=5

3×i+9=30

3×i=30-9

3×i=21

i=21:3

i=7

5×n-5=40

5×n=40+5

5×n=45

n=45:5

n=9