1) 16 * 10 : 2 = 160 : 2 = 80
2) х - задуманное число
х * 5 : 3 = 30
5х : 3 = 30
5х = 30 * 3
5х = 90
х = 90 : 5
х = 18
Проверим:
18 * 5 : 3 = 30
90 : 3 = 30
30 = 30
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1) 16 * 10 : 2 = 160 : 2 = 80
2) х - задуманное число
х * 5 : 3 = 30
5х : 3 = 30
5х = 30 * 3
5х = 90
х = 90 : 5
х = 18
Проверим:
18 * 5 : 3 = 30
90 : 3 = 30
30 = 30