Question

В 450кг руды содержится 67.5 % меди сколько % меди в 500 кг руды?

Answer 1

450 кг - 67,5 %
500 кг  -  х %
х = (500*67,5)/450 = 75 %

Answer 2

To find out how much copper is in 500 kg of ore, we can use the concept of proportionality. The amount of copper is directly proportional to the weight of the ore. We can set up a proportion using the given information:

Let x be the percentage of copper in 500 kg of ore.

We know that the percentage of copper in 450 kg of ore is 67.5%.

So, we can set up the following proportion:

(Percentage of copper in 450 kg) / 450 kg = x / 500 kg

67.5% / 450 kg = x / 500 kg

To find x, cross-multiply and solve for x:

x = (67.5% * 500 kg) / 450 kg

x = (0.675 * 500) / 450

x = 0.75

So, there is 0.75 or 75% copper in 500 kg of ore.