Question

A peice of elastic was stretched by 24% to a length of 31 cm.find its unstreched orignal length.

Answer 1

$original \: length \: be \: x \\ x + 24\% \: of \: x = 31 \\ x + \frac{24x}{100} = 31 \\ \frac{124x}{100} = 31 \\ x = 3100 \div 124 \\ x = 25cm$