Ted weighs partly used spools to estimate the length of cable that remains. He knows that 1 metre of lighting cable weighs 85 grams, and that an empty spool weighs 260 grams. Ted weighs the partly used spool shown. It has a total weight 1540 grams. Which of these calculations will give Ted an estimate of the number of metres of cable left on the spool?
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idk
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soory
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