Question
If an arc subtends an angle of 90o at the
centre of the circle whose radius is 28 cm, then find the area of that sector. [Take π = 22/7]Solution
Area of the sector = (θ/360) × π × r2 [Where ‘θ’ is the angle subtended by the minor arc and ‘r’ is the radius of the circle] Desired area = (90/360) × (22/7) × 28 × 28 = 616 cm2
Present ages of ‘A’, ‘B’ and ‘C’ are in the ratio 5:11:13, respectively. If present average age of ‘A’ and ‘C’ is 36 years, then fin...
In a school there are 20 girls. The average age of the girls is decreased by 2 months when one girl aged 18 years is 8 replaced by a new girl. What is t...
When 15 years is subtracted from the present age of A and the obtained result is divided by 4, then the present age of his nephew is obtained. If the pr...
Twelve years from now, the combined ages of A and B will be 94 years. Eight years ago, the ratio of the total of A and B's ages to the age of C was 3:2...
The average age of A, B and C is 25 years, while the average age of B, A and D is 23 years. If the ratio of the age of C and D is 5:3, respectively, the...
In an office, there are 18 employees. The average age of all the employees is 28 years. If the age of three senior managers is included, then the averag...
In a classroom there are 14 boys and 11 girls. Average age of each boy and each girl is 21 years and 15 years respectively. The sum of ages of all the b...
Present age of ‘A’ is 40% more than that of ‘B’. If 11 years hence from now, ‘B’ will be 5 years younger than ‘A’, then find the sum of ...
- The ratio of present ages of Ankit to that of Bhavesh is 3:5 while the ratio of present ages of Karan to that of Bhavesh is 2:5. If the age of Karan, 5 yea...
The present age of Preeti is twice Ruchi’s present age. Six years ago, their average age was 15 years. What will be the Preeti’s age after f...
Relevant for Exams:
