If one third of one fifth of a number is 15 July 8, 2019 16 32 64 128 If one third of one fifth of a number is 15 then one tenth of that number is 1 2 3 or 5 One-fifth of a number d is 22 1 2 3 4 five If one third of one fourth of a number is 15 then three tenths of that number is 1/5 of 5