240:12=20(кг)
20*15=300(кг)
А) |+5| - |-5| = 5-5 = 0
б) |-5| - |+5| = 5-5 = 0
в) |+3| - |-3| = 3-3 = 0
<span>г) |-3| - |+3| = 3-3 = 0</span>
180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211.212,213,214,215,216,217,218,219,220. Если задание на логику, то я не знаю. Ну а так-41 слово.