Answer :

You add 23 and 17: 
23 + 17= 40 
Then you find 1/8 of 40:
1/8 * 40/1= 5
[tex]\sf 23+17=40 \\ \\ \frac{1}{8}*40= \frac{40}{8}=\boxed{\sf 5} [/tex]

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