Packing of a game on phone. How to make?

How to pack a game on android what after installation weight would be small? When packing the project installation of a game occupies 37 MB. But at installation on phone of 200 MB from which textures and objects in the game weigh in a bag of 50 MB. What occupies other 150 MB and as it is possible to reduce weight?

For android you need to buy a ue3 license.