Answer:
0.67kg
Explanation:
To start we have to subtract the flour that he use to make hot cross buns
the remaining flour will be..
16.45 kg - 6.4kg = 10.05kg
Now if with that flour he made 15 batches of scones we just have to divide it by that amount
10.05 / 15 = 0.67 kg
the amount of kilograms that will be per batch of scone is 0.67