Question 1183716
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The problem is so easy to solve mentally in a few seconds, I'm not sure what the instructions are asking you to do.  Maybe something like this:<br>
100 and 200 years would make a total of 300 -- too much.
80 and 160 years would make a total of 240 -- not enough.<br>
Then continue with another guess for the ages with the smaller age something greater than 80... and continue until you find the correct ages.<br>