有一个神秘人，你如果猜对他的年龄就奖励 500 个亿，但每猜一次需要支付 1 元，你愿意吗？

you (Note: In Taiwan, 妳 is used to address females, but in mainland China, it is not commonly used. Instead, 你 is used to address both males and females.)

(used after an attribute when it modifies a noun)

to guess

variant of 個|个[ge4]

to add; to pour in (a fluid)

CL:把[ba3],個|个[ge4]

mystery

(third-person singular) (since the early 20th century, usu. male) he; him; his

used in 嗎啡|吗啡[ma3 fei1]

100 million

to (a place); until (a time); up to (a point)

if

CL:個|个[ge4],位[wei4]

classifier for years (of age)

(adverb for emphatic assertion)

that is

to obtain; to receive; to get

to reward