*Source: The GRE Big Book*

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I think the answer is C

Let’s say the value of husband’s estate is x. Then the amount of share the wife received will be 1/3x. The amount of share which will be distributed among her three sons will be (1-1/3x) = 2/3x. So now we have another piece of information which says the wife and one of her sons received a total of 60k. Three sons received a share of 2/3x. Therefore, for one son the share will be 1/3*2/3x = 2/9x. Now, 1/3x+2/9x=60,000. After solving for x we get x as 108000.