I need help for some js math problem

Question

i need help,
how i can get a value number from random object properties range (ex: sam, 34 - 42) and the random result is substracted by second object properties (ex: lamer, 150). And this thing will work in one button.
sorry for bad english. Thank's ^_^

Answer 1

Here are some hints. Math.random , .length , charAt , function

Answer 2

thank's fo ur hint