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1,5kg • x + 0,8kg • (11 - x) = 13kg
1,5x + 8,8 - 0,8x = 13
0,7x = 4,2 / 0,7
x = 6 <- większe słoiki
11 - x = 11 - 6 = 5 <- mniejsze słoiki
3.19
(x - 4) + 6 + x + 6 = 34
2x + 8 = 34
2x = 26
x = 13 <- Elżbieta
x - 4 = 13 - 4 = 9 <- Hania