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D:I=3rest15
D+I=111
D=?
I=?


Răspuns :

d : l = 3 r 15
d = 3 * l + 15
d + l = 111
d = 111 - l
111 - l = 3 * l + 15
111 - 15 = 3*l + l
96 = 4 * l
l = 96 : 4
l = 24
d = 111 - 24
d = 87