Question

an alloy consists of 30% zinc, 45%nickel and the rest copper find the weight of copper in 800g of all alloy

Answer 1

an alloy consists of 30% zinc , 45% nickel 
copper % = 100 - (30 % +45%) 
                = 100-75
               = 25%
weight copper = 25% of 800 g
                      = 1/4 * 800g
                      = 200g

Answer 2

Answer:

The weight of copper in 800g alloy is 200g.

Step-by-step explanation:

• This is a problem of percentages, where an object is divided into several parts and each fraction forms a part of the total.
• The fraction when multiplied by 100 gives percentage.

• Sum of all the percentages should form 100.

• Percentage = (Value of a part/Total value) * 100

Calculation:

Given, alloy consists of zinc, nickel, copper.

Percentage of zinc in the alloy = 30%

Percentage of nickel in the alloy = 45%

Percentage of copper in the alloy

= 100% - (Percentage of zinc + Percentage of nickel)

= 100 - (30 + 45)

= 100 - 75

Percentage of copper in the alloy = 25%

Weight of alloy = 800g

Weight of copper = (Percentage of copper * Weight of alloy)/100

Weight of copper = (25*800)/100

Weight of copper = 200g

Therefore, weight of copper in 800g alloy is 200g.

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