Question

The sum of a 2-digit no.is 7. If 27 is added to the no,it's digits are interchanged. Find the original number​

Answer 1

$let \: the \: original \: no. \: be \: x \\ so. the \: 2digit \: be \: x + 3x \\x + 3x = 7 + 27 \\ 4x = 34 \\ x = \frac{34}{4} \\ x = 8 \times \frac{4}{2}$

so the original no. 34/4

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