Answer:

20 packs of sugar

Step-by-step explanation:

For every 1 kilogram there is 3/4 kg. Thus, in 15 kg there is also 15– 3/4kg of sugar.

Therefore, the 15kg less the 3/4kg, for each kg there is remaining 1/4kg.

To make the 1/4kg become 3/4kg, we need to add 2– 1/4kg.

Divide 15(this illustrates the remaining 15– 1/4kg) into 3 (this is to make 1/4kg be 3/4kg)

= 5

Hence,

15– 3/4 kg of sugar + 5– 3/4 kg of sugar = 20 – 3/4 kg packs of sugar.