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QUESTION
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 use
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?
