Question

A triangle is made up of 2 red sticks and 1 blue sticks . The length of a red stick is given by r and that of a blue stick is given by b. Using this information, write an expression for the total length of sticks in the pattern given below:

Answer 1

Given, length of a red stick = 2r and length of a blue stick = b

From the given figure,

The total number of red sticks = 18 

And the total number of blue sticks = 6

 
So, the total length of sticks = 18r + 6b = 6(3r + b)

Hence, the required expression is 6(3r + b).