Question

40%of residents in a building 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 are into research and development? If there are 1500 people residing in the building, how many people are in the service class, the business class and research and development?​

Answer 1

There are 2063people in service classand 137 people in research and development

Answer 2

There are 600 people in the service class, 825 in the business class and 75 in research and development.

Step-by-step explanation:

Consider the provided information.

It is given that 40% of residents in a building are from the service class ,55% of the residents are from the business class and the remaining are into research and development.

Let x percent into research and development.

Therefore,

40%+55%+x=100%

95%+x=100%

x=5%

Hence, 5 percent are in research and development.

There are 1500 people residing in the building.

40% of 1500 is: $\frac{40}{100}\times1500=600$

55% of 1500 is:  $\frac{55}{100}\times1500=825$

5% of 1500 is:  $\frac{5}{100}\times1500=75$

There are 600 people in the service class, 825 in the business class and 75 in research and development.

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Percentage got 696 marks out of 900 . find their percentage​

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