Question

A piece of elastic was stretched to 24% to a length of 31cm.Find its unstretched original length

Answer 1

Let the original length be x

Percent by which elastic is stretched = 24%

24% of elastic= 24/100× x = 24x/100 = 6x/25

x + 6x/25 = 31

(25x+6x)/25 = 31

31x/25 = 31

31x = 25×31 = 775

x = 775/31 = 25 cm