The Greatest Common Factor (GCF) for 75 and 105, notation CGF(75,105), is 15. Explanation: The factors of 75 are 1,3,5,15,25,75; The factors of 105 are 1,3,5,7,15,21,35,105.
Let the amount B pays be £x So, A pays £125 B pays £x They pay in the ration 3:2 Therefore, 125/x = 3/2 Cross multiplying we get, 125 x 2 = 3x 3x = 250 x = £63.33