Question
Select the number from among the given options that can
replace the question mark (?) in the following series. 19, 38, 114, 570, ?, 43890Solution
The pattern followed here is: 19 (x 2) 38 (x 3) - 114 (x 5) - 570 (x 7) - 3990 - 3990 (x 11) - 43890 The pattern is: Each subsequent number is multiplied by the immediate prime number (starting with 2). Thus, the missing number is 3990. Hence, the correct answer is (B).
Three years ago, the ratio of ages of C and D was 3:4. Seven years from now, the ratio of their ages will be 5:6. What is the current age of C?
- The present age ratio of Kavya to Neha is 3:5. Seven years ago, Neha was 5 years more than twice the age of Kavya. If present average age of Kavya, Neha an...
The ratio of the age of M after 3 years to the age of N after 2 years is 5:4. The sum of the ages of N and O after 6 years is 68 years. The age of O bef...
In four years, the age ratio of 'X' and 'Y' will be 10:13, respectively. The current average age of 'Y' and 'Z' is 54 years, and the present average age...
The sum of the present ages of Tina and her father is 50 years. Tina's father is 4 years older than her mother, and two years ago, Tina's mother's age w...
A is 3 years older than B while C is 4 years younger than B. The ratio of age of A, 8 years hence and age of B, 6 years ago is 5:4. What was age of C, 1...
5years ago, the ages of 'Arunita' and 'Bhasker' were in the ratio 2:3. 5years from now, the age of 'Arunita' will be 25% less than that of 'Bhasker'. De...
Present average age of A, B, and C is 30 years. If 5 years ago, the average age of A and C was 25 years, then find the present age of B.
7 years ago, the age ratio between ‘M’ and ‘N’ was 4:5. Present average age of ‘M’ and ‘O’ is 70 years. Determine the current age of ‘...
Present age of ‘A’ is 40% more than that of ‘B’. If 25 years hence from now, ‘B’ will be 15 years younger than ‘A’, then find the sum of...
Relevant for Exams:
