1)
Салфетки 3•3 можно вырезать 3 шт. по ширине куска ткани 10 см и 4 шт по длине куска 13 см. Всего 12 салфеток.
2)
Салфетки 2•4 можно выкроить двумя в обоих получится 15 салфеток. .
а) По длине куска ткани 13:4=3 (1 дм останется) и ровно 10:2= 5 по 2 дм по ширине =15 штук.
б) 6 по 2 дм по длине куска ткани п два по ширине, и еще 3 по длине куска ( см. рисунок)
15-12=3.
Салфеток размером 2•4 получится больше на 3 штуки. .
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100-96=4 (л) хватит
90-94= -6 (л) не хватит.
ответ: 100 литров бензина хватит чтобы доехать в город и обратно.90 л.