Question

The first side of a triangle measures 4 in. less than the second side, the third side is 3 in. more than the first side, and the perimeter is 15 in. How long is the third side?
If s represents the length of the second side, which of the following represents the length of the third side?

s - 4
s + 3
s - 1

Answer 1

Less would be minus and more is plus so the first side is 4 less than the second, or s - 4, and the third side is 3 more than the first, or
3 + s - 4.
3-4 + s = -1 + s or s - 1

So the answer is the third option, s - 1.