(B) The third of which number must be subtracted from 7/ 11 to give 24/55

(D) If 1/3 is added to a number and the sum is multiplied by 2. the answer is 8/3 . What is the number?

(B) Let the third number be x.

So, 7/11 - x = 24/55
=> x = 7/11 - 24/55
=> x = (35-24)/55
=> x = 11/55

Therefore, the third number is 11/55.

(D) Let the number be y.
According to the question, (1/3 + y) * 2 = 8/3
=> 2/3 + 2y = 8/3
=> 2y = 8/3 - 2/3
=> 2y = 6/3
=> y = 3/2

Therefore, the number is 3/2.