Question 499763
My interpretation of what you wrote is:
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{{{S + S/5}}}
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You could do it using fifths.
{{{S = (5/5)S}}}
{{{S/5 = (1/5)S}}}
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So,
{{{(5/5)S + (1/5)S = (6/5)S}}}
{{{(6/5)S = 1.2S}}}
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Done.