Sagot :
2kişi 15gün
3işçi -
15çarparsak 3 ile 45 eder
45 ide 2 ye bölerseniz sonuç 90 olur
2 işçi 15gün
3işçi ?gün
ters olantılı
2.15=30
3.?=30
30/3=10
10 günde bitirir
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