Subject + 多少
多少 (duōshǎo) is used to ask "how much" or "how many." It can be used with both countable and uncountable nouns, unlike 几 which is limited to small countable quantities. It can also be used rhetorically to mean "the amount of," as in 财富多少 (how much wealth).
这件衣服多少钱?
Zhè jiàn yīfu duōshao qián?
How much does this piece of clothing cost?
你知道今天来了多少人吗?
Nǐ zhīdào jīntiān lái le duōshao rén ma?
Do you know how many people came today?
不管花多少时间,我都要把这件事做完。
Bùguǎn huā duōshao shíjiān, wǒ dōu yào bǎ zhè jiàn shì zuò wán.
No matter how much time it takes, I will finish this.