Question

купил то­ва­ры на сумму 1200 руб­лей. На по­куп­ку кла­ви­а­ту­ры было из­рас­хо­до­ва­но 40% этой суммы, а на по­куп­ку мыши — 25% всей суммы. Сколь­ко руб­лей сто­и­ли осталь­ные то­ва­ры, куп­лен­ные Петей?

Answer 1

Ответ:

100x=1200p ( все)

x=1200p/100 = 12p(1%)

40x(%) = 12*40 =480p(кла­ви­а­ту­ры)

25x(%) = 12*25 =300p(мыши)

100-(40+25)=100-65=35(осталь­ные то­ва­ры %)

35x(%)= 12*35 =420p(руб­лей сто­и­ли осталь­ные то­ва­ры)

300+420+480=1200

Answer 2

Calculation of the Cost of the Keyboard and Mouse

To calculate the cost of the keyboard and mouse, we need to find the amount spent on each item based on the given percentages.

The keyboard was purchased for 40% of the total amount spent, and the mouse was purchased for 25% of the total amount spent.

Let's calculate the cost of the keyboard and mouse:

1. Cost of the keyboard: - The keyboard was purchased for 40% of the total amount spent. - Therefore, the cost of the keyboard is 40% of 1200 rubles. - 40% of 1200 rubles = 0.4 * 1200 rubles = 480 rubles.

2. Cost of the mouse: - The mouse was purchased for 25% of the total amount spent. - Therefore, the cost of the mouse is 25% of 1200 rubles. - 25% of 1200 rubles = 0.25 * 1200 rubles = 300 rubles.

Calculation of the Cost of Other Items Purchased

To find the cost of the other items purchased by Petya, we need to subtract the cost of the keyboard and mouse from the total amount spent.

Let's calculate the cost of the other items:

1. Total amount spent: - Petya spent 1200 rubles in total.

2. Cost of the keyboard and mouse: - The cost of the keyboard is 480 rubles. - The cost of the mouse is 300 rubles. - Therefore, the total cost of the keyboard and mouse is 480 rubles + 300 rubles = 780 rubles.

3. Cost of the other items: - To find the cost of the other items, we subtract the cost of the keyboard and mouse from the total amount spent. - Cost of other items = Total amount spent - Cost of keyboard and mouse. - Cost of other items = 1200 rubles - 780 rubles = 420 rubles.

Answer

Therefore, the cost of the other items purchased by Petya is 420 rubles.