Задания которые отмечены!Срочно!!Заранее спасибо,Даю 100 баллов,только не спамьте))

Количество яблок - x Тогда: 15 < x < 21 x может принимать значения: 16, 17, 18, 19, 20. Из этих чисел кратны трём: 18. 18/3 = 6 одноклассников. Ответ: 6 одноклассников Антон может угостить. [latex] \left \{ {{ \frac{0.6x+6}{3}- \frac{0.2x+1}{2} \ \textgreater \ 1 } \atop { \frac{4-3x}{2}\ \textgreater \ 5 }} \right. \left \{ {{ \frac{1.2x+12-0.6x-3}{6}\ \textgreater \ 1} \atop {4-3x\ \textgreater \ 10}} \right. \left \{ {{0.6x+9\ \textgreater \ 6} \atop {-3x\ \textgreater \ 6}} \right. \left \{ {{0.6x\ \textgreater \ -3} \atop {x\ \textless \ -2}} \right. \left \{ {{x\ \textgreater \ -5} \atop {x\ \textless \ -2}} \right. \\ OTBET:(-5; -2)[/latex] [latex]\left \{ {{ \frac{0.8x-1}{5} -\frac{1}{2}x \leq 0.48 } \atop { \frac{x-5}{3}-1 \leq \frac{x}{6} }} \right. \left \{ {{ \frac{1.6x-2-5x}{10} \leq 0.48 } \atop { \frac{2x-10-x}{6} \leq 1 }} \right. \left \{ {{-3.4x-2 \leq 4.8} \atop {x-10 \leq 6}} \right. \left \{ {{-3.4x \leq 6.8} \atop {x \leq 16}} \right. \left \{ {{x \geq -2} \atop {x \leq 16}} \right. \\ OTBET:[-2; 16][/latex] [latex] \left \{ {{ \frac{0.2x-1}{7}- \frac{0.3x}{2} \leq 0.1 } \atop { \frac{x+1}{3}-1 \leq \frac{x}{4} }} \right. \left \{ { \frac{0.4x-2-2.1x}{14} \leq 0.1 } \atop { \frac{4x+4-3x}{12} \leq 1 }} \right. \left \{ {{-1.7x-2 \leq 1.4} \atop {x+4 \leq 12}} \right. \left \{ {{-1.7x \leq 3.4} \atop {x \leq 8}} \right. \left \{ {{x \geq -2} \atop {x \leq 8}} \right. \\ OTBET:[-2;8][/latex] [latex] \left \{ {{ \frac{1.4-x}{5}- \frac{0.6x}{3}\ \textless \ 2.28} \atop { \frac{2x-1}{7}-1\ \textgreater \ \frac{x}{3} }} \right. \left \{ {{ \frac{4.2-3x-3x}{15}\ \textless \ 2.28 } \atop { \frac{6x-3-7x}{21}\ \textgreater \ 1 }} \right. \left \{ {{4.2-6x\ \textless \ 34.2} \atop {-x-3\ \textgreater \ 21}} \right. \left \{ {{-6x\ \textless \ 30} \atop {-x\ \textgreater \ 24}} \right. \left \{ {{x\ \textgreater \ -5} \atop {x\ \textless \ -24}} \right. [/latex] OTBET: (-∞; -24) ∪ (-5; +∞).