1. (13 * 12500) / 100 = 1625
12500 - 1625 = 10875
2. (27 * 100) / 30 = 90
3. (10 * 40) / 100 = 4
40 + 4 = 44
900 : 44 = 20
2*6=12 Ответ:на озере плавают 12 лебедей.
(400*0,15%)= 60+400=460
819*0.17= 139. 819-139= 680
160*0.15=24. 160-24=136
3х+5х+96=1568
8х=1568-96
8х=1472
х=1472:8
х=184)
1)12/108=6/54=3/27=1/9, <span>70/180=7/18, 2/18 и 7/18.
</span><span>2)14/35=2/5, 20/45 и 18/45.
</span><span>3) 8/64=1/8, 175/280=35/56, 35/56 и 7/56.</span>