Question

За завтраком,обедом и ужином был съеден один батон хлеба. За завтраком съели 2/9,а за обедом 5/18 батона. Когда съели больше хлеба-за завтраком или за обедом? Какую часть батона съели за завтраком и за обедом? Какая часть батона осталась на ужин?

Answer 1

2/9 приводим к общему знаменателю
2/9=4/18
4/18 меньше 5/18
5/18+4/18=9/18(ч) за обедом и завтраком
18/18-9/18=9/18(ч) осталось на ужин
Ответ:за завтраком съели меньше чем за обедом,на ужин осталось 9/18 или
1/2 часть

Answer 2

Analysis:

To determine when more bread was eaten, we need to compare the fractions of bread consumed for breakfast and lunch. We also need to calculate the remaining fraction of bread for dinner.

Calculation:

Let's calculate the fractions of bread consumed for breakfast and lunch:

- For breakfast: 2/9 of a loaf of bread was eaten. - For lunch: 5/18 of a loaf of bread was eaten.

To compare the fractions, we need to find a common denominator. The least common multiple (LCM) of 9 and 18 is 18. Let's convert the fractions to have a denominator of 18:

- For breakfast: (2/9) * (2/2) = 4/18 of a loaf of bread was eaten. - For lunch: (5/18) * (1/1) = 5/18 of a loaf of bread was eaten.

Now, let's compare the fractions:

- For breakfast: 4/18 of a loaf of bread was eaten. - For lunch: 5/18 of a loaf of bread was eaten.

Since 5/18 is greater than 4/18, more bread was eaten for lunch than for breakfast.

Calculation of remaining bread:

To calculate the remaining fraction of bread for dinner, we need to subtract the sum of the fractions consumed for breakfast and lunch from the total fraction of a loaf of bread:

- Total fraction of a loaf of bread: 1/1 - Fraction consumed for breakfast: 4/18 - Fraction consumed for lunch: 5/18

Let's calculate the remaining fraction for dinner:

- Remaining fraction for dinner: (1/1) - (4/18) - (5/18) = 9/18 - 4/18 - 5/18 = 0/18

Therefore, no fraction of a loaf of bread remained for dinner.

Summary:

- More bread was eaten for lunch than for breakfast. - For breakfast, 4/18 of a loaf of bread was eaten. - For lunch, 5/18 of a loaf of bread was eaten. - No fraction of a loaf of bread remained for dinner.