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мальчиков 28 - х
4х + 3(28 - х) = 100
4х + 84 - 3х = 100
х = 100 - 84
х = 16(девочек)
28 - 16 = 12 (мальчиков)
2) пирожок стоит х руб
бутылка воды стоит у рублей
37 х + 29 у = 1156|·(-38) -37·38 x - 38·29 y = -38·1156
43 х + 38 у = 1438|· 29 29·43 x + 38·29 y = 29·1438
-159 x = -2226
x = 14(руб) - стоит пирожок
37· 14 + 29 у = 1156
29 у = 1156 - 518
29 у = 636
у = 21(руб) - стоит бутылка воды
3) миндаль х - 20
фундук х г
арахис 2х г
х - 20 + х + 2х = 208
4х = 228
х = 57(г) - фундук
2·57 = 114(г) - арахис
57 - 20 = 37(г) - миндаль