Question

На постройку дома ушло 2400 красных, 3400 белых и еще 2400 черных кирпичей. Красный кирпич весит 2 кг, белый 8, а черный 5. Сколько всего центнеров весят все кирпичи? А) 410ц В) 440ц С) 430 ц Д) 420ц

Answer 1

2400*2=4800(кг)=48 ц
3400*8=27200(кг)=272
2400*5=12000(кг)=120 ц
48+272+120=440 ц
Ответ: В. 440 ц

Answer 2

Calculation of the Total Weight of Bricks

To calculate the total weight of all the bricks, we need to multiply the number of each type of brick by its respective weight and then convert the total weight to centners.

Given: - Red bricks: 2400 - White bricks: 3400 - Black bricks: 2400

Weight per brick: - Red brick: 2 kg - White brick: 8 kg - Black brick: 5 kg

Let's calculate the total weight:

1. Total weight of red bricks: 2400 * 2 kg = 4800 kg 2. Total weight of white bricks: 3400 * 8 kg = 27200 kg 3. Total weight of black bricks: 2400 * 5 kg = 12000 kg

Now, let's convert the total weight to centners:

1. Total weight of all bricks: 4800 kg + 27200 kg + 12000 kg = 44000 kg 2. Total weight in centners: 44000 kg / 100 = 440 centners

Therefore, the correct answer is B) 440 ц.