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Ответ

Ответ дан
sergeevaolga5

Ответ:

30

Объяснение:

Пусть х - задуманное число, тогда по условию задачи

можно составить уравнение:

x+0,8*20=70-0,8x          (80%=80:100=0,8)

x+16=70-0,8x

x+0,8x=70-16

1,8x=54

x=30

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