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m+t+R=140
R=m:4
R=t:5​


Răspuns :

m=4R
t=5R

4R+5R+R=140
10R=140
R=14
m=56
t=70
m + t + r = 140

r = m : 4

r = t : 5

m = 4 × r

t = 5 × r

4 × r + 5 × r + r = 140

10 × r = 140

r = 140 : 10

r = 14

m = 4 × 14

m = 56

t = 5 × 14

t = 70