Coffee & Drink Puzzle

Coffee and drink puzzle looks easy. However, can you solve this one? Please have a try and share your answers in the Comments section.

created by brainfans

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There is no hint

let coffee = C, drink = D.

Then C+D=10,
D-C=8

C+8+C=10 => 2C=2 => C=1. Then 1+D=10 => D=9. Applied to result 1x9=9 which is the final answer.

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