how much does it cost?为什么是how much 不是how many

how much does it cost?为什么是how much 不是how many How much does it cost? how much does it cost 为什么是how much does it weigh 而不是how many.. how much does it cost还是how much does it? How much () it () (cost) How much does it cost=什么 15.__________ does the steak cost?(How many/ How much) 为什么how many是可数名词,而how much不是? How much does it how much does it cost 可不可以用how much is it cost? How much is it going to cost和how much does it cost有什么区别?