Please help! A 31 cm core sample from a large tree is to be divided into five pieces. Two of the pieces will be one length, and the other three will be 2 cm longer. What is the length of the LARGE pieces?

A. 5 cm
B. 5.5 cm
C. 6.5 cm
D. 7 cm

D

Step-by-step explanation:

let the 2 equal pieces be x then the other 3 are x + 2 , so summing gives

x + x + x + 2 + x + 2 + x + 2 = 31 , that is

5x + 6 = 31 ( subtract 6 from both sides )

5x = 25 ( divide both sides by 5 )

x = 5

Then the large pieces are x + 2 = 5 + 2 = 7 cm

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.

i believe the correct answer is b.