Problema Solution
A pieces of elastic was stretched by 24% to a length of 31cm.find its unstretched original length.
Answer provided by our tutors
use the proportion is/off = %/100
31 cm is 124% of the original length
31/x = 124/100 cross multiply so solve for x
3100 = 124x
25 = x
therefore, it's original unstretched length is 25 cm