Question

If each side of a triangle is increased by 4 cm, the ratio of the perimeters of the new triangle and the given triangle is 7:5. Find the perimeter of the given triangle.​

Answer 1

Answer:

let the side of the triangle be x

then it's perimeter equal to 3x

now side increased by 3cm

then side of new triangle is x+3 and it's perimeter is 3(x+3)=3x+9

3x:3x+9 = 7:5