What quantity must be subtracted from each term of ratio 9 : 17 to make it equal to 1 : 3 ?

The work done by (3x - 1) men in (2x + 3) days and the work done by (3x - 4) men in (2x + 1) days are in the ratio 4 : 3. Find the value of x.

If 2a = 3b and 4b = 5c, find : a : c.

Find the compound ratio of 2 : 3, 9 : 14 and 14 : 27.