8/15 + 2/9 у=2 • 2,5
8/15 + 2/9у=5
2/9у = 5 - 8/15= 4 15-8/15 = 4 7/15
2/9у=4 7/15
у= 4 7/15 : 2/9 = 67•9/15•2=201/10=20, 1
у=20, 1
(350+х)*2=1000
700+2х=1000
2х=1000-700
2х=300
х=150
2)771*100:1095=70%
156*100:1095=14%
134*100:1095=12%
23*100:1095=2%
11*100:1095=1%