to make a sweet the ratio of sugar to flour is 2:3.  if 45 kg of flour is used the amount of sugar used is????

Given:  The ratio of sugar to flour is 2 : 3

Let the amount of sugar used = x kg

Amount of flour used = 45 kg

Now, desired ratio of sugar to flour and ratio of sugar used to flour used must be in proportion.

2 : 3 : : x : 45

Thus, the amount of sugar used is 30 kg.