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Thesolutionofexpressionis, 60We have to given that,To find Twenty-one is 35% of what number.Let thesolutionof expression is, xHence, We can write as,21 = 35% of xSolve for x,21 = 35/100 × x21 = 0.35xx = 21 / 0.35x = 60Therefore, Thesolutionofexpressionis, 60Learn more about thepercentvisit:brainly.com/question/24877689#SPJ6...