We are required to find the total portion of pizza Michelle and Lucinda ate altogether.
The total portion of pizza Michelle and Lucinda ate is 0.85 of the total large pizza
let
Total pizza = x
Michelle ate = 0.25 of x
= 0.25 × x
= 0.25x
Lucinda ate = 3/5 of x
= 3/5 × x
= 3/5x
Total portion Michelle and Lucinda ate = 0.25x + 3/5x
= 0.25x + 0.6x
= 0.85x
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