Question

636. 1) Вика прочитала 169 страниц книги, в которой 260 страниц. Сколь- ко процентов страниц книги прочитала Вика? 2) У Маши было 340 р. За 238 р. она купила подарок маме. Какой про- цент денег истратила Маша на подарок? 3) Найдите процент содержания олова в руде, если 80 т этой руды со- держит 6,4 толова. 4) За каникулы Витя планировал решить 60 задач по математике, а решил 102 задачи. На сколько процентов Витя выполнил «план по решению задач»? 5) Определите процент содержания сахара в растворе, если 250 г рас- твора содержит 115 г сахара.​

Answer 1

Ответ:

1) 260 стр. - 100%

169 стр. - х%

х = 169 * 100 : 260

х = 65% книги - прочитала Вика;

2) 340 руб. - 100%

238 руб. - х%

х = 238 * 100 : 340

х = 70% денег - истратила Маша на подарок.

Пошаговое объяснение:2 задача

Answer 2

1) To find out what percentage of the book Vika has read, we need to divide the number of pages she has read by the total number of pages in the book and then multiply by 100.

Vika has read 169 pages out of a total of 260 pages in the book.

To calculate the percentage, we can use the formula:

Percentage = (Number of pages read / Total number of pages) x 100

Plugging in the values, we get:

Percentage = (169 / 260) x 100 = 65%

Therefore, Vika has read 65% of the book. [[1]]

2) To calculate the percentage of money Masha spent on the gift, we need to divide the amount spent on the gift by the total amount of money she had and then multiply by 100.

Masha had 340 rubles and spent 238 rubles on the gift.

To calculate the percentage, we can use the formula:

Percentage = (Amount spent on the gift / Total amount of money) x 100

Plugging in the values, we get:

Percentage = (238 / 340) x 100 = 70%

Therefore, Masha spent 70% of her money on the gift. [[2]]

3) To find the percentage of lead content in the ore, we need to divide the weight of lead by the weight of the ore and then multiply by 100.

The ore contains 80 tons and has 6.4 tons of lead.

To calculate the percentage, we can use the formula:

Percentage = (Weight of lead / Weight of the ore) x 100

Plugging in the values, we get:

Percentage = (6.4 / 80) x 100 = 8%

Therefore, the ore contains 8% lead. [[3]]

4) To calculate the percentage of tasks Vitya completed compared to his plan, we need to divide the number of tasks he completed by the number of tasks he planned and then multiply by 100.

Vitya planned to solve 60 math problems but ended up solving 102 problems.

To calculate the percentage, we can use the formula:

Percentage = (Number of tasks completed / Number of tasks planned) x 100

Plugging in the values, we get:

Percentage = (102 / 60) x 100 = 170%

Therefore, Vitya completed 170% of his planned tasks. [[4]]

5) To determine the percentage of sugar in the solution, we need to divide the weight of sugar by the weight of the solution and then multiply by 100.

The solution weighs 250 grams and contains 115 grams of sugar.

To calculate the percentage, we can use the formula:

Percentage = (Weight of sugar / Weight of the solution) x 100

Plugging in the values, we get:

Percentage = (115 / 250) x 100 = 46%

Therefore, the solution contains 46% sugar. [[5]]