Question

Two sides of a triangle are 6 m and 7 m. The perimeter of the triangle is 23 m. What's the third side?

Answer 1

23-6=17
17-7=10
The third side is 10m

Answer 2

Since there are 3 sides of a triangle, and you already have two sides, just subtract the sun of the two sides from the total. You have 6 and 7 meters. Combine those into 13, then subtract if from 23. You get 10 meters. So, the mystery side would be 10m.