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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?

Respuesta :

apologiabiology
so weight=spool+thread
spool=260grams
thread=85m grams where m=meters left

so

260+85m=1540
minus 260 both sides
85m=1280
divide both sides by 85
m=15.058823529411764705882352941176
about 15 meters left

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