Al bob and carl can life 240 pounds. bob carl and dan can lift 250 pounds.
carl dan and al can lift 260 pounds.
al bob and dan can lift 270 pounds.
how many pounds can all four men lift if they work together?

1020 POUNDS.

Step-by-step explanation:

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for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis: