Question

1) An alloy consists of 45% nickel, 30% zinc and the remaining is copper. Find the percentage of
Copper in the alloy.

2)In a newspaper 25% news is about sports, 15% is about business trends, 5% entertainment. 25%
current affairs and remaining is international news. Find the percentage of international news that appear in the news paper

3)40% of residents in a building complex are from the service class, 55% of the residents are from
the business class and the remaining are into research and development. What percentage of the
residents in the building complex are into research and development? If there are 1500 people
residing in the building complex, how many people are in the service class, business class and in
research and development?​

Answer 1

Answer:

85%

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

1) 45+30 = 75%

= 100% - 75% = 25%

Percentage of copper is 25%

2) Sports = 25%

Bussiness Trends = 15%

Entertainment = 5%

Current Affairs = 25%

= 25 + 15 + 5 + 25 = 75%

International News = 100% – 75% = 25%

3) Service class = 40%

55% = Bussiness Class

-> Remaining are research and development = 5%

In service Class

40/100 × 1500 = 600 People

In Bussiness Class

55/100 × 1500 = 825 People

Research and development people

= 600 + 825 - 1500

= 75 People

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