Question

Which one of the following fraction should be subtracted from 9/15 such the difference becomes 11/20

Answer 1

Let the number to be subtracted be x.
Given ,
9/15 - x = 11/20
=>9/15 - 11/20 = x
=> x = (9*4 - 11*3)/60
=> x = (36-33)/60
=> x = 3/60
=> x = 1/20.
Hence, 1/20 should be subtarcted from 9/15 to get 11/20.