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
Express the following as decimal fractions:
7.5%
x is 5% of y, y is 24% of z. If x = 480, find the values of y and z.
Express the following percentage as a fraction and as a decimal number:
5 %
Mr. Singh’s monthly salary is ₹ 15,000. This month he was promoted with an increment of ₹ 3,000 in his salary. Express his increment as a percent of his original salary.
If three candidates A, B and C in a school election got 153,245 and 102 votes respectively, then the percentage of votes got by the winner is _____________
A picture of chess board is given. The squares that do not have the pieces
Yazhini scored 15 out of 25 in a test. Express the marks scored by her in percentage
A student earned a grade of 80% on a math test that had 20 problems. How many problems on this test did the student answer correctly?
30% of ₹ 360 = ______.
15 kg is ______ % of 50 kg.
