Question
If √f + (1/√f) = 5, then find the value of f +
(1/f).Solution
Given, √f + (1/√f) = 5
On squaring both sides:
(√f + (1/√f)) 2 = 52
Expanding:
f + 2 + (1/f) = 25
Simplifying:
f + (1/f) + 2 = 25
Subtracting 2 from both sides:
f + (1/f) = 23
- A number is first increased by 100%, then increased by 30% and then decreased by 75%. If the resultant number is 195, then find the original number.
Ravi scored 30% of marks in a test of 150 marks and 40% of marks in another test of 250 marks. Find his overall percentage in the two tests together.
In a department 20% of the employees are females. 40% of the male employees know Hindi. The total number of employees who know Hindi is 46%. Find the pe...
Kalpana allocates 30% of her monthly income to educational expenses and spends 60% of what remains on clubbing activities. If she spends Rs. 3024 on clu...
The respective ratio of monthly income of A to monthly income of B is 6:7, and A’s saving is (100/7)% more than B’s saving. Find the expenditure of ...
5% of a = b, then b% of 20 is the same as __________.
- A person "P" allocates their monthly income as follows: First, 25% is spent on education. From the remaining amount, 40% is used for food. After that, 20% ...
Neha goes to a bookstore with a certain amount of money. She can buy 60 notebooks or 20 novels with the money she has. However, she saves 15% of the amo...
The population of a town rose by 7% and then 9% in the next year, followed by a drop of 15% in the third year. If the population in 2023 stood at 27,214...
Manmeet decided to donate 20% of her salary to an NGO. On the day of donation she changed her mind and donated Rs. 13520 which was 80% of what she decid...
