I'm confused on how to set this equation?

The lengths of the sides of a triangle are in the ratio 5 : 6 : 7. Describe the length of the longest side if the perimeter is less than 54 cm.

Question

I'm confused on how to set this equation? 

The lengths of the sides of a triangle are in the ratio 5 : 6 : 7. Describe the length of the longest side if the perimeter is less than 54 cm.

anonymous · Answer

Solve for x
7 x+6 x+5 x=54
then multiply x by 7 and you are done

anonymous · Answer

You find  18 x =54
Hence x =3
The longest is 7x=21

unklerhaukus · Answer

it should be an in-equation

anonymous · Answer

What do you mean in-equation?

triciaal · Answer

inequality means not equal.  Perimeter is less than 54 
x<3 therefore 7x <21
correct to set = to get the boundary first

unklerhaukus · Answer

inequations have inequality symbols >,<,≤, or ≥ 
 rather than equality symbol =