Linear Algebra Applications

I am having trouble setting this problem up in a matrix. I can solve it using a simple algebra equation but I need to solve it using a system of equations and row reduce the matrix. Can someone help me set it up? Thanks. Here is the problem.

A father plans to distribute his estate, worth $234,000, among his four daughter as follows: 2/3 of the estate is to be split equally among the daughters. For the rest, each daughter is to receive $3,000 for each year that remains until her 21st birthday. Given that the daughters are each 3 years apart, how much would each receive from her father's estate? How old are the daughters now?