Question : Of the three numbers, the first is twice the second, and the second is twice the third. The average of the reciprocal of the numbers is $\frac{7}{12}$. The numbers are:

Option 1: 20, 10 and 5

Option 2: 4, 2 and 1

Option 3: 36, 18 and 9

Option 4: 16, 8 and 4

Question : If p : q : r = 2 : 5 : 3 and r : s = 6 : 5, then what is the value of p : q : r : s?

Option 1: 4 : 12 : 7 : 3

Option 2: 4 : 10 : 6 : 5

Option 3: 6 : 5 : 8 : 10

Option 4: 8 : 12 : 7 : 8

Question : The average of three numbers of which the greatest is 16 is 12. If the smallest is half of the greatest, the remaining number is:

Option 1: 12

Option 2: 8

Option 3: 14

Option 4: 10

Question : Directions: Which two numbers should be interchanged, to make the given equation correct?
4 × 8 – 12 + 5 = 16

Option 1: 4 and 5

Option 2: 8 and 5

Option 3: 16 and 8

Option 4: 12 and 16

Question : In three positive numbers, the ratio of first and second is 3 : 4 and the ratio of second and third is 3 : 5. The product of first and third is 4500. What is the sum of the three numbers?

Option 1: 282

Option 2: 235

Option 3: 198

Option 4: 205