 Hello and welcome to the session. In this session we discussed the following question which says what should be added to 5 3 upon 7 to get 9 1 upon 3? Let's move on to the solution now. We have to find out the number which should be added to 5 3 upon 7 let that number be x so that we get 9 1 upon 3. So to find out the number x we need to subtract 5 3 upon 7 from 9 1 upon 3 that is x would be equal to 9 1 upon 3 can be written as 28 upon 3 minus 5 3 upon 7 can be written as 38 upon 7. Now to subtract these two fractions we need to find out the LCM of their denominators that is 3 and 7 and the LCM of 3 and 7 is equal to 21. So we write 21 here in the denominator. Now 3 7 times is 21 so in the numerator we have 21 multiplied by 7 minus 7 3 times is 21 so 38 multiplied by 3. So from here we get x is equal to 196 minus 114 upon 21 or you can say that x is equal to 82 upon 21. Therefore we get x equal to 3 19 upon 21. Thus we can say that the number 3 19 upon 21 should be added 5 3 upon 7 to get 9 1 upon 3. So this is the required number. This completes the session. Hope you have understood the solution of this question.