Which number should be subtracted from 7,12 and 18 such that the resultant numbers are in continued proportion?

Which number should be subtracted from 12,16 and 21 so that resultant numbers are in continued proportion?

Which number should be subtracted from 13,25 and 55 so that resultant numbers are in continued proportion?

Check whether the numbers are in continued proportions: 3,5,8

Check whether the numbers are in continued proportions: 1,2,3

Check whether the numbers are in continued proportions: 9,12,16

Check whether the numbers are in continued proportions: 2,4,8.

Which number should be subtracted from each of the numbers 13, 25 and 55 so that the resulting numbers would be in continued proportion?

Check whether the numbers 4, 10 and 15 are in continued proportion or not ?

The sum of three numbers is 15.If the second number is subtracted from the sum of first and third numbers then we get 5.When the third number is subtracted from the sum of twice the first number and the second number,we get4.Find the three numbers.