Advertisements
Advertisements
प्रश्न
Air is an important inexhaustible natural resource. It is essential for the survival of human beings, microbes, plants, and animals. The following table shows the percentage of various gases in the air.
| Contents of air | Percentage (by volume) |
| Nitrogen | 78 |
| Oxygen | 21 |
| Other (carbon dioxide, inert gases, water vapours, etc.) | 1 |
If a certain quantity (by volume) of air contains 4,200 litres of oxygen, find the total quantity of air taken and the amount of nitrogen in it.
Advertisements
उत्तर
Nitrogen in air = 78%, Oxygen = 21%, Others = 1%
If the air contains 4200 litres of oxygen, then the total quantity of air
= `(4200xx100)/21` litres
= 200 × 100 litres
= 20000 litres
and the amount of nitrogen in it = 20000 of 78%
= `20000xx78/100`
= 15600 litres
APPEARS IN
संबंधित प्रश्न
Write the following as percent:
\[\frac{14}{625}\]
Express the following as percent: 0.25
Express the following statement in the percentage form:
21 eggs out of 30 are good
Express the first quantity as a percent of the second:
42 seconds, 6 minutes
Rohit’s age is 12 years and Geeta’s age is 15 years. Express Rohit’s age as a percent of Geeta’s age.
A class has 30 boys and 20 girls. Find the percentage of the number of boys as compared with the number of girls.
A number when increased by 18% gives 236. Find the number
12% of 250 litre is the same as ________ of 150 litre
A picture of chess board is given. Find the percentage of the squares that have the pieces 
Savitri obtained 440 marks out of 500 in an examination. She secured ______% marks in the examination.
