Question

Срочно. даю 10 баллов. Для спортивнйо школы купили 20 футбольнх мячей и 30 волейбольных мячей. Футбольный мяч стоил 12 рублей, а волейбольный в 2 раза дешевле. Сколько стоила вся покупка?

Answer 1

20*12+30*6=240+180=420

Answer 2

20×12 + 30×(12×2)=240 + 30×24=240+720=960рублей

Answer 3

Calculation of the Total Cost

To calculate the total cost of the purchase, we need to determine the cost of the footballs and the volleyballs separately and then add them together.

Let's start by calculating the cost of the footballs. It is given that each football costs 12 rubles, and a total of 20 footballs were purchased. Therefore, the cost of the footballs can be calculated as follows:

Cost of footballs = Cost per football × Number of footballs = 12 rubles × 20 footballs = 240 rubles.

Next, let's calculate the cost of the volleyballs. It is mentioned that the volleyballs are twice as cheap as the footballs. Therefore, the cost of each volleyball can be calculated as follows:

Cost of each volleyball = Cost of footballs ÷ 2 = 240 rubles ÷ 2 = 120 rubles.

Since 30 volleyballs were purchased, the total cost of the volleyballs can be calculated as follows:

Cost of volleyballs = Cost per volleyball × Number of volleyballs = 120 rubles × 30 volleyballs = 3600 rubles.

Finally, to find the total cost of the purchase, we add the cost of the footballs and the cost of the volleyballs together:

Total cost of the purchase = Cost of footballs + Cost of volleyballs = 240 rubles + 3600 rubles = 3840 rubles.

Therefore, the total cost of the purchase for the sports school is 3840 rubles.

Please note that the calculations are based on the information provided in the question and the assumption that the cost of the volleyballs is exactly half the cost of the footballs.