Advertisements
Advertisements
Question
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
Solution
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
RELATED QUESTIONS
The population of a town increases by 10% annually. If the present population is 60000, what will be its population after 2 years?
A’s income is 25% more than B’s. Find, B’s income is how much percent less than A’s.
A number is increased by 10% and the resulting number is again increased by 20%. What is the overall percentage increase in the number?
Find the value of `33 1/3 %` of 27 m
Express the first quantity as a percent of the second:
42 seconds, 6 minutes
2 minutes is _______ % to an hour
In a school of 1400 students, there are 420 girls. The percentage of boys in the school is _______
A tank can hold 200 litres of water. At present, it is only 40% full. How many litres of water to fill in the tank, so that it is 75% full?
The food labels given below give information about 2 types of soup: cream of tomato and sweet corn. Use these labels to answer the given questions. (All the servings are based on a 2000 calorie diet.)
| Sweet Corn | Cream of Tomato | ||
| Nutrition Facts | Nutrition Facts | ||
| Serving Size 1 cup (240ml) | Serving Size 1 cup (240ml) | ||
| About 2 serving per Container | About 2 serving per Container | ||
| Amount Per Serving | Amount Per Serving | ||
| Calories 90 | Calories from Fat 9 | Calories 100 | Calories from Fat 20 |
| % Daily Value* | % Daily Value* | ||
| Total Fat 2g | 2% | Total Fat 2g | 3% |
| Saturated Fat-0g | 0% | Saturated Fat-1.5g | 6% |
| Cholesterol 0mg | 0% | Cholesterol 10mg | 3% |
| Sodium 540mg | 22% | Sodium 690mg | 29% |
| Total Carbohydrate 17g | 6% | Total Carbohydrate 17g | 6% |
| Dietary Fibre 3 gram | 14% | Dietary Fibre 4 gram | 18% |
| Sugar 5g | Sugar 11g | ||
| Protein 3g | Protein 2g | ||
| Vitamin A 30% | Vitamin C 10% | Vitamin A 20% | Vitamin C 20% |
| Calcium 2% | Iron 6% | Calcium 0% | Iron 8% |
| *Per cent Daily Values are based on a 2,000 calorie diet. |
*Per cent Daily Values are based on a 2,000 calorie diet. |
||
Which can be measured more accurately : the total amount of fat in cream of tomato soup or the total amount of fat in sweet corn soup? Explain.
The per cent of pure gold in 14 carat gold is about 58.3%. A 14 carat gold ring weighs 7.6 grams. How many grams of pure gold are in the ring?
