Question

Use an algebraic equation to solve the problem. The sides of a triangle are in the ratio 3 : 4 : 5. What is the length of each side if the perimeter of the triangle is 90 cm?
A. 10.5 cm, 11.5 cm, and 12.5 cm

B. 22.5 cm, 30 cm, and 37.5 cm

C. 7.5 cm, 11.5 cm, and 32.1 cm

D. 19.3 cm, 25.7 cm, and 32.1 cm

Answer 1

The answer is B. All you have to do is go answer by answer and add up all the side since perimeter is where you add up all the sides.

Answer 2

3x + 4x + 5x = 90

12 x  = 90
x       =   7.5

So the ratio would be :

B. 22.5 cm, 30 cm, and 37.5 cm

Hope this helps