Question
Find the area of a ring formed by two concentric circles
of radii 14 cm and 7 cm. Take pi = 22/7.Solution
ATQ, Area = pi(R2 - r2) = (22/7)*(142 - 72) 142 = 196, 72 = 49 Difference = 196 - 49 = 147 Area = (22/7)147 = 2221 = 462 cm2
My sister is 5 years elder to me. My father was 30 years of age when my brother was born while my mother was 28 years of age when I was born. If my bro...
Average age of 4 daughter of a family is 8 years and average age of daughter together with their parents is 16 years. If mother is 4 years younger than...
The present ages of 'Meena' and 'Tina' are in the ratio 7:9. Two years hence, Meena’s age will be 20% less than Tina’s age. What is Meena’s curren...
The sum of ages of organization members (including clerk and managers) is 380 years. The total ages of clerks and managers are in the ratio 1:3 and the ...
When 6 years ago age of Vikas was divided by 18, the present age of his granddaughter Geeta is obtained. If Geeta is 2 years younger than her sister Sit...
When 18 years is subtracted from the present age of A and the obtained result is divided by 3, then the present age of his nephew is obtained. If the pr...
Six years ago, the ratio of ages of Alok and Ravi was 7:9, respectively. Eight years hence, the ratio of ages of Rohan and Ravi will be 5:6, respectivel...
Present ages of 'Amit' and 'Bishnu' are in the ratio 4:5, respectively. If seven years hence from now, the ratio of ages of 'Amit...
The present age ratio of X and Y is 4:5. Also, the ratio of X’s age 7 years ago and Y’s age 6 years later is 1:2. Find their total current age.
The ratio between the present age of Beena and Meenal is 5:6, where Sumit is 2 years younger than Meenal then find the ratio of their ages 5 years hence.
Relevant for Exams:
