1/4 of a rod was painted red. 2/5 was painted orange and 2/7 of the remainder was painted yellow. the yellow section was 20cm long how long was the rod

200cm long

Step-by-step explanation:

Let the length of the rod be x

red = 1/4 of the rod , which means 1/4 of x

orange = 2/5 of x

The remainder = x - ( +)

= x - ()

=

yellow = 2/7 of the remainder , that is

yellow = 2/7 of

yellow =

and it was given that the yellow section was 20cm long , that is

= 20cm

x = 20 x10

x = 200

Therefore the rod was 200cm long

one that is bigger than 3 1/2