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Geometry Difficulty 2.0 Junior Find the answer United Kingdom

An isosceles triangle has a side of length $20$ cm. Of the remaining two side-lengths, one is equal to two-fifths of the other. What is the length of the perimeter of this triangle?

(A) $36$ cm (B) $48$ cm (C) $60$ cm (D) $90$ cm (E) $120$ cm

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