Si en una hora se producen 15 litros de agua, entonces solo se multiplica 4, 12, 18 y 20 por 15, asi:
(4)(15)=60
(12)(15)=180
(18)(15)=270
(20)(15)=300
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Si en una hora se producen 15 litros de agua, entonces solo se multiplica 4, 12, 18 y 20 por 15, asi:
(4)(15)=60
(12)(15)=180
(18)(15)=270
(20)(15)=300