疑问代词“几” The Interrogative Pronoun "几"

疑问代词“几”用来询问数量的多少，一般用于询问10以下的数字。
The interrogative pronoun "几" is used to ask about a number, usually less than 10.

疑问代词“多”用在形容词的前面，对程度进行提问，回答时要说出数量。例如：
The interrogative pronoun "多" is used before an adjective, asking about the degree of something. A specific quantity should be given to answer the question. For example:

• A：你多大？
  B：我16岁。
• A：王医生的儿子多高？
  B：他儿子一米七。
• A：他多高？
  B：一米八几。