To calculate how much flour Ahsan has left after using a portion of it, we need to subtract the amount used from the initial amount of flour.
Ahsan initially had 3 kg of flour.
She used 13/5 kg to make bread.
She also used 3/4 kg to make a cake.
To find out how much flour she has left, we need to subtract the amounts used from the initial amount:
Initial amount of flour - Amount used for bread - Amount used for cake
3 kg - 13/5 kg - 3/4 kg
To subtract fractions, we need a common denominator. The least common multiple of 5 and 4 is 20:
3 kg = 60/20 kg
13/5 kg = 52/20 kg
3/4 kg = 15/20 kg
Now we can perform the subtraction:
60/20 kg - 52/20 kg - 15/20 kg
Combining the fractions:
(60 - 52 - 15)/20 kg
Performing the subtraction:
(8 - 15)/20 kg
-7/20 kg
Therefore, Ahsan has -7/20 kg of flour, which means she has used more flour than she initially had. This suggests that there may have been an error in the calculations or the given values.