Final answer:
The ratio of the weight of copper to nickel in a material with 84 units of copper and 15 units of nickel is 84:15, which simplifies to 28:5.
Step-by-step explanation:
To find the ratio of the weight of copper to nickel in a material that contains 84 units of copper and 15 units of nickel, we simply divide the number of units of copper by the number of units of nickel. Therefore, the ratio of copper to nickel is 84:15. To simplify this ratio, we can divide both numbers by their greatest common divisor, which in this case is 3. Thus, the simplified ratio is 28:5.
To find the ratio of the weight of copper to nickel in the material, we need to compare the number of units of copper to the number of units of nickel. In this case, there are 84 units of copper and 15 units of nickel.
To calculate the ratio, we divide the number of units of copper by the number of units of nickel: 84/15 = 5.6.
Therefore, the ratio of the weight of copper to nickel in the material is 5.6:1.