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a×2=b. b:3=c. c+36=d. d-19=87

Răspuns :

d=87+19=106
c=106-36=70
b=70*3=210
a=210:2=105
d-19=87 => d= 87+19= 106
c+ 36 =d
c +36 =106
c= 106-36 = 70
b : 3 = c
b = 3c = 3 x 70
b = 210
a x 2 = b
a x 2 = 210
a = 210 : 2
a = 105