Question

К сплаву массой 600 грамм содержашему 20% меди добавили, 40 грамм меди .Каким было процентное содержание меди в новом сплаве?

Answer 1

600 г - 20% меди
40 г - 100% меди

Общее кол-во в граммах: 600+40=640
Общее кол-во меди: 600*0.2+40=120+40=160

160/640=0.25, => процентное содержание меди составляет 25%

Answer 2

Calculating the Percentage of Copper in the New Alloy

To calculate the percentage of copper in the new alloy after adding 40 grams of copper to the original 600-gram alloy containing 20% copper, we can use the following formula:

Percentage of copper = (Total mass of copper / Total mass of alloy) * 100

Given: - Initial mass of the alloy = 600 grams - Initial percentage of copper in the alloy = 20% - Mass of copper added = 40 grams

Using the formula, we can calculate the percentage of copper in the new alloy.

Calculation

Step 1: Calculate the total mass of copper in the original alloy: - Total mass of copper = (20/100) * 600 grams = 120 grams

Step 2: Calculate the total mass of the new alloy after adding 40 grams of copper: - Total mass of the new alloy = 600 grams + 40 grams = 640 grams

Step 3: Calculate the percentage of copper in the new alloy: - Percentage of copper = (Total mass of copper / Total mass of the new alloy) * 100 - Percentage of copper = (120 grams / 640 grams) * 100 - Percentage of copper ≈ 18.75%

Answer

The percentage of copper in the new alloy after adding 40 grams of copper is approximately 18.75%.