Explanation:
The Niece is 13 years old
The nephew is 12 years old
the summation of their ages is 25
if $2000 was shared among them
The Niece:
13/25 x 2000/1
0.54 x 2000 = $1040
Nephew:
12/25 x 2000/1
0.48 x 2000
= $960
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