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27 Mar 2021, 22:40
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u0422811
Alternate Approach :
Let Jane's age when she had baby-sit be J.
Then the current age of the oldest child: C = J/2 + (32-J).
On solving this, we get C=32-J/2.
As we can see from the equation that C will be max when J is min. Therefore, as min J is 18, hence Max C will be 23.
P.S. If asked for minimum age, it will simply be 10 years, as the last child that J baby-sit could be a new-born (there is no information on the minimum age of the child that she can baby-sit).
15 Jan 2026, 06:57
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