Question

НА ПОКУПКУ УЧЕБНИКОВ САША ПОТРАТИЛ 4/7 ВСЕХ ИМЕВШИХСЯ У НЕГО ДЕНЕГ А НА ПОКУПКУ ТЕТРАДЕЙ И АЛЬБОМОВ 15% ОСТАВШИХСЯ ДЕНЕГ ПОСЛЕ ЧЕГО У НЕГО ОСТАЛОСЬ ЕЩЕ 76,5 РУБЛЕЙ СКОЛЬКО ДЕНЕГ БЫЛО У Саши?

Answer 1

х руб было у Саши

х-4/7х=3/7х руб осталось после покупки учебников

3/7*0,15х руб потрачено на тетради и альбомы

3/7х- 3/7*0,15х  руб осталось у Саши

  3/7х- 3/7*0,15х=76,5

 3/7(х-0,15х)=76,5

0,85х= 178,5

х= 210 руб было у Саши

 

Answer 2

Calculation of Sasha's Money

To calculate how much money Sasha had initially, we need to follow the given information step by step.

1. Sasha spent 4/7 of his total money on textbooks. 2. He then spent 15% of the remaining money on notebooks and albums. 3. After these expenses, Sasha had 76.5 rubles left.

Let's calculate how much money Sasha had initially.

Step 1: Sasha spent 4/7 of his money on textbooks. Step 2: He spent 15% of the remaining money on notebooks and albums. Step 3: Sasha had 76.5 rubles left.

Let's denote Sasha's initial money as x.

1. Sasha spent 4/7 of his money on textbooks: - Amount spent on textbooks = (4/7) * x

2. Sasha spent 15% of the remaining money on notebooks and albums: - Remaining money after buying textbooks = x - (4/7) * x = (3/7) * x - Amount spent on notebooks and albums = (15/100) * (3/7) * x

3. Sasha had 76.5 rubles left: - Remaining money after buying notebooks and albums = (3/7) * x - (15/100) * (3/7) * x = (1 - (15/100)) * (3/7) * x = (85/100) * (3/7) * x = (255/700) * x - (255/700) * x = 76.5

To find the value of x, we can solve the equation:

(255/700) * x = 76.5

Let's calculate the value of x:

x = (76.5 * 700) / 255

x ≈ 210 rubles

Therefore, Sasha initially had approximately 210 rubles.