ответ: число маленьких коробок у, больших - х. Тогда
х+у=12⇒у=12-х
х*800+у*500=6900⇒х*800+6000-500*х=6900⇒300*х=900⇒х=3. Тогда у=12-3=9.
ответ: маленьких пачек 9, больших пачек 3.
Пошаговое объяснение:
Heads and Tails ”not in vain won the nomination for the best TV shows, since the idea itself is unique, not only in terms of tourism, but also in terms of the entire meaning of the program, since it thinks not only about the rich life of travel. It reveals all the romanticism of tourism, and the accessibility of admiration for everything that nature and God himself have created, revealing the unique sides of cities, peoples and nations with their customs, which would hardly have been known without traveling on the TV screen. Changing the presenters, the author of the program enriches the story, in which each storyteller makes his own contribution and presents the delights of the world according to his vision.
y = 9
x = 3
Пошаговое объяснение:
x800 + y500 = 6900
x + y = 12
x = 12 - y
800(12 - y) + 500y = 6900
9600 -300y = 6900
300y = 2700
y = 9
x = 3