When the whole is the same, why does it take 4 copies of 1 tenth to equal 2 copies of 1 fifth?

Because you can split the same whole into different parts. You can split a cake into 10 peices and eat 4 peices of the cake. That would be eating 4/10 of a cake. That would equal eating the same amount of cake if you split the cake into 5 peices and ate 2 of them.

Claude debussy's music was associated with answer choice 3, impressionist