Question
In the absence of ozone layer, which rays will enter
into atmosphere?Solution
The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone (O3). The ozone layer absorbs 97-99% of the Sun's medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which potentially damages exposed life forms on Earth.
Average of 20 numbers is 90. Average of first 8 numbers is 92 while average of last nine numbers is 40. If ninth number is 25% less than the tenth numbe...
If the average of 38, 49, 42, and 'b' is 50, then find the value of '2b'.
The average of 25, 46, and ‘y’ is 28. What is the value of ‘y’?
The average of 9 numbers is 25. If one more number is added, the new average becomes 26. Find the number added.
In a school, the average number of books that some numbers of boys have is 80 and average number of books that some numbers of girls have is 50. If each...
A number is such that when it is multiplied by 9, it gives another number which is as much above from 420 as the original number (itself) is below 420. ...
The average of two numbers is 11 more than the smaller number among them. If the greater number is 87.5% more than the smaller number, then find the sum...
- The average age of (x + 3) students of a class is 12 years. If the 42 years old class teacher is also included then average age of the class gets increased...
- The average of fifty numbers is 55 while the average of first twenty-five numbers and last twenty-five numbers is 60 and 70, respectively. Find the twenty-...
The average age of 14 girls is 42 years. If the age of two more girl is added the average decreases by one and a half year. What is the sum of the age o...
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