Assuming you are asking "If a bag of 1 1/2 kg has 3/4 taken out of it, how much is left?", then the solution is as follows:
To calculate how much is left after taking out 3/4 from the bag's weight of 1 1/2 kg, we first need to convert 1 1/2 into an improper fraction.
1 1/2 = (2 x 1 + 1)/2 = 3/2
So the original weight of the bag is 3/2 kg.
Then, we can determine the quantity taken out of the bag:
3/4 x 3/2 kg = 9/8 kg
Therefore, the amount left in the bag is the original weight minus the quantity removed:
3/2 kg - 9/8 kg = 6/8 kg or 3/4 kg
So the amount leftover in the bag after removing 3/4 of its weight is 3/4 kg.