My Math Forum Decision maker equation (comparing 3 variables)

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 August 11th, 2016, 10:45 AM #1 Newbie   Joined: Aug 2016 From: KSA Posts: 1 Thanks: 0 Decision maker equation (comparing 3 variables) I want to create an equation to make decision on the best product that i want to be the best for example: I have this 4 products: - product1: lives 1 months, quality 70%, people rating 50% - product2: lives 2 months, quality 60%, people rating 60% - product3: lives 3 months, quality 50%, people rating 60% - product4: lives 10 months, quality 40%, people rating 40% how can i make an equation so from this equation i can choose product3 as the best choose for customers? i couldn't create a relation between these choose based on what in my view is the best i tried to do 4 equation with 4 varibles (x1,x2,x3 and x4) and assume results then apply it to 100 product and it doesn't work

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