Un bazin avand capacitatea de 63 dal se umple cu apa.Se folosesc trei robinete.Primul cu debitul de 2 ori mai mare decat al doil
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1. The total must be at least $1975: 
2. Dog walks is no more than 4 times lawns:
3. At least 50 dog walks:
2. Dog walks is no more than 4 times lawns:
3. At least 50 dog walks: