Предмет: Математика, автор: natashashishova

юбка, блузка и пиджак стоят вместе 1680 руб. Стоимость блузки состовляет 40% стоимости пиджака и 2/7 стоимости юбки. Какова стоимость вещи? Во сколько раз стоимость юбки больше среднего арифметического стоимости блузки и пиджака?

Ответы

Автор ответа: yanaaleksandrov

п- пиджак
ю- юбка
б- блузка
б=0,4п
б=2/7ю=0,4п
ю=7/2*0,4п
п+0,4п+7/2*0,4п=1680
1п+2/5п+7/5п=1680
14/5п=1680
п=600
б=0,4*600=240
ю=240*7/2=840
ср. арифм =(600+240)/2=420
840/420=2
ответ пиджак=600р, блузка-240р,юбка-840р. в 2 раза стоимость юбки больше,чем ср. арифм. стоимости блузки и пиджака

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