Question

Afla nr necunoscut

Bx2x5=140
C:2:3=5
36:3:3xd=20x2

Answer 1

b x 10 = 140 
b = 140 : 10 
b = 14 

c : 2 = 5 x 3 
c :2 = 15 
c = 15 x 2 
c = 30 

12 : 3 x d = 40 
4 x d = 40 
d = 40 : 4 
d = 10 

Answer 2

b * 2 * 5 = 140
b = 140 : 10
b = 14
c : 2 : 3 = 5
c = 2 * 3 * 5
c = 30
36 : 3 : 3 * d = 20 * 2
4d = 40
d = 40 : 4
d = 10