Х - задуманное число
х+1/4х=20
1 1/4х=20
5/4х=20
х=20:5/4
Х=20*4/5
Х=16
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Х - задуманное число
х+1/4х=20
1 1/4х=20
5/4х=20
х=20:5/4
Х=20*4/5
Х=16