Can someone please show me the equation to solve this.

Question

tank support requires 12 pieces of I-beam to be cut. Some pieces are 33" in length. Others are 29" in length. The length of the I beam used is 376 inches. Find the number of pieces of each length used. (x = the number of piece of 33" used, and 12 - x = the number of pieces of 29" length used) Can someone please show me the equation to solve this.

Answer 1

s represents the number of 29"

12 - s represents the number of 33"

 

29s + 33(12 - s) = 376

 

Can you solve for s and answer?