Numbers

Question 21

How many terms are there in 3,9,27,81........531441?

• 25
• 12
• 13
• 14

Question 22

If the average of four consecutive odd numbers is 16, find the smallest of these numbers?

• 5

• 7

• 13

• 11

Question 23

If the sum of two numbers is 13 and the sum of their square is 85. Find the numbers?

• 6 & 7
• 5 & 8
• 4 & 9
• 3 & 10

Question 24

A two-digit number is such that the product of the digits is 12. When 9 is subtracted from the number, the digits are reversed. The number is:

• 34
• 62
• 43
• 26

Question 25

Find a positive number which when increased by 16 is equal to 80 times the reciprocal of the number

• 20
• -4
• -10
• 4

Question 26

What is the sum of two consecutive odd numbers, the difference of whose squares is 56?

• 30
• 28
• 34
• 32

Question 27

The product of two numbers is 108 and the sum of their squares is 225. The difference of the number is:

• 5
• 4
• 3
• None of these

Question 28

The average of 21 results is 20. Average of 1^st 10 of them is 24 that of last 10 is 14. the result of 11\'th is :

• 42
• 44
• 46
• 40