The lengths of the sides of a triangle are in the ration 3: 5: 7. its perimeter is 120 cm. find the length of the longest side of the triangle

The answer to your question is: 56 cm

Step-by-step explanation:

Data

Ratio = 3 : 5 : 7

Perimeter = 120 cm

Process

# of parts = 3 + 5 +7 = 15

Divide 120 by 15 = 120 / 15

Number of parts  = 8

First side = 3 x 8 = 24 cm

Second side = 5 x 8 = 40 cm

Third side = 7 x 8 = 56 cm

Perimeter = 24 + 40 + 56

                = 120 cm

i think it is x = 1.2

practice. practice. practice.