Răspuns :
Fie x,y cele doua numere cautate:
x-y=15
x:y=2 rest 7 → x=2×y+7
____________________
2×y+7-y=15
y+7=15
y=15-7
y=8
x=2×8+7
x=16+7
x=23
x-y=15
x:y=2 rest 7 → x=2×y+7
____________________
2×y+7-y=15
y+7=15
y=15-7
y=8
x=2×8+7
x=16+7
x=23