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Wire length used for a circle and 20 cm wire = 7 * 22/7 + 20 = 42 cm

(a)  500/42 = 11 38/42 

So there were 38 cm left after 11 circles and 11 * 20 cm wires.

38 – 20 = 18 cm

Length of wire left was 18 cm

(b) There were 12 circles. 

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