Thirty books are bought for sh 1080. Some cost sh40 and others sh30. How many books of each kind are bought?

Logical equivalent of the give question is its contrapositive

The scale factor of what ?

After the experience with great britain having a monarchy, the united states realized that everyone needed to have a voice in the government. the fact that americans had no voice was the main reason for the war. thus, they created a democracy, where the people voted for their representatives and the government ruled with the consent of the people.