Question

1). Для по­крас­ки 1 кв.м по­тол­ка тре­бу­ет­ся 240 г крас­ки. Крас­ка про­да­ет­ся в бан­ках по 2,5 кг. Сколь­ко банок крас­ки нужно ку­пить для по­крас­ки по­тол­ка пло­ща­дью 50 кв.м? 2). В лет­нем ла­ге­ре на каж­до­го участ­ни­ка по­ла­га­ет­ся 30 г са­ха­ра в день. В ла­ге­ре 103 че­ло­ве­ка. Сколь­ко ки­ло­грам­мо­вых упа­ко­вок са­ха­ра по­на­до­бит­ся на весь ла­герь на 6 дней? 3).Бегун про­бе­жал 180 мет­ров за 20 се­кунд. Най­ди­те сред­нюю ско­рость бе­гу­на. Ответ дайте в ки­ло­мет­рах в час.

Answer 1

Ответ2)
130×30=3900(г)-сахара нужно лагерю на 1 день
3900×6=23.400(г)
23.400=23.4кг
Ответ:на 6 дней лагерю нужно 23.4 кг сахара

Answer 2

1. 50*240 = 12000 гр. краски на весь потолок.
12000/2500=4,8. Округляем до 5.

Answer 3

1) Для покраски 1 кв.м потолка требуется 240 г краски. Краска продается в банках по 2,5 кг. Сколько банок краски нужно купить для покраски потолка площадью 50 кв.м?

To find out how many cans of paint are needed to paint a ceiling with an area of 50 square meters, we can use the following steps:

1. Calculate the total amount of paint needed for the ceiling: - The amount of paint needed for 1 square meter of ceiling is 240 grams. - Therefore, the total amount of paint needed for 50 square meters of ceiling is 240 grams/square meter * 50 square meters = 12,000 grams.

2. Convert the total amount of paint needed from grams to kilograms: - There are 1,000 grams in a kilogram. - Therefore, the total amount of paint needed is 12,000 grams / 1,000 = 12 kilograms.

3. Determine the number of cans of paint needed: - Each can of paint contains 2.5 kilograms. - Divide the total amount of paint needed by the amount of paint in each can: 12 kilograms / 2.5 kilograms/can = 4.8 cans.

Since we cannot purchase a fraction of a can, we need to round up to the nearest whole number. Therefore, 5 cans of paint are needed to paint a ceiling with an area of 50 square meters.

2) В летнем лагере на каждого участника полагается 30 г сахара в день. В лагере 103 человека. Сколько килограммовых упаковок сахара понадобится на весь лагерь на 6 дней?

To find out how many kilograms of sugar are needed for the entire camp for 6 days, we can use the following steps:

1. Calculate the total amount of sugar needed for one day: - Each participant is allocated 30 grams of sugar per day. - Therefore, the total amount of sugar needed for one day is 30 grams/participant * 103 participants = 3,090 grams.

2. Convert the total amount of sugar needed for one day from grams to kilograms: - There are 1,000 grams in a kilogram. - Therefore, the total amount of sugar needed for one day is 3,090 grams / 1,000 = 3.09 kilograms.

3. Calculate the total amount of sugar needed for 6 days: - Multiply the amount of sugar needed for one day by the number of days: 3.09 kilograms/day * 6 days = 18.54 kilograms.

Since we cannot purchase a fraction of a kilogram, we need to round up to the nearest whole number. Therefore, 19 kilograms of sugar are needed for the entire camp for 6 days.

3) Бегун пробежал 180 метров за 20 секунд. Найдите среднюю скорость бегуна. Ответ дайте в километрах в час.

To find the average speed of the runner, we can use the following steps:

1. Convert the distance from meters to kilometers: - There are 1,000 meters in a kilometer. - Therefore, the distance is 180 meters / 1,000 = 0.18 kilometers.

2. Convert the time from seconds to hours: - There are 3,600 seconds in an hour. - Therefore, the time is 20 seconds / 3,600 = 0.0056 hours.

3. Calculate the average speed: - Divide the distance by the time: 0.18 kilometers / 0.0056 hours = 32.14 kilometers per hour.

Therefore, the average speed of the runner is approximately 32.14 kilometers per hour.