Question

the sides of a triangle are in the ratio of 5 is to 6 is to 7 if the longest side is 21 cm what is the length of its smallest side

Answer 1

Let us take the given ratio be 5x : 6x: 7x .
Then clearly the longest side is 7x .
So , Atq., 7x = 21
or x = 21/7
Therefore x= 3
So the length of smallest side is 5x = 5×3 cm . = 15 cm

Answer 2

Answers as fallows

let the sides be

5x

6x

7x

now according to question

longest side 21 ok

7x= 21

x=21/7=3

x=3

5(3)=15

6(3)=18

so the following sides are 15 and 18 cm

hope it helps

:) :)