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Ответ дан
murysenichka

Ответ:

20%=0,2

m(р-pа)=m(в-ва)+m(р-теля)

w(в-ва)=m(в-ва)/m(р-ра)=>

m(p-pa)=m(в-ва)/w(в-ва)

m(p-pa)=60г/0,2=300г.

Ответ:300г.

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