Find the length of the shorter piece

Question

a board, 81 cm long is cut into theee pieces such that the second piece is twice as long as the first and the third is 6 cm longer than the second. 

Answer 1

s = 2f

 

t = s + 6

 

f + s + t = 81

 

f + 2f + s + 6 = 81

 

f + 2f + 2f + 6 = 81

 

5f = 75

 

f = 15

 

s = 30

 

t = 36