Others Maths Puzzle

if
87+92=18
12+61=4
57+83=13
62+31=??

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Others Other Question

Using 8 exactly eight times to make a 1000.

You can use any mathematical symbols
put any mathematic sign n prove it

2 2 2=6

3 3 3=6

4 4 4=6

5 5 5=6

6 6 6=6

7 7 7=6

8 8 8=6

9 9 9=6
???