Question

a,b,c,d =- nr
a=1/5 * b
b=1/3 *c
c=1/2 *d
d=29 +a

Answer 1

d=29+a
inlocuim pe rand in ultima relatie pe a, b, c 
d=29+b/5
d=29+c/15
d=29+d/30
d-d/30=29
amplificam prima cu 30
(30d-d)/30=29
29d=29*30
d=30
a=30-29
a=1
c=1*30/2=15
b=1*15/3=5