Answer:
1. 16-x-x-x-x = 0
x = 4
2. 18-y-y-y-y-y-y-y-y-y = 0
y = 2
3. 27-x-x-x =0
x = 9
4. 100-y-y-y-y-y-y-y-y-y-y = 0
y = 10
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