# Quiz: Can You Solve This Sum ?

[Hint]: Think out of the box…

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${1}_{9} = 1.9 = {1}_{10}$
${13}_{9} = 1.9 + 3 = {12}_{10}$
${15}_{9} = 1.9 + 5 = {14}_{10}$
${30}_{9} = 3.9 + 0 = {27}_{10}$