Question

9. Each side of a triangle is increased by 10 cm.
If the ratio of the perimeters of the new triangle
and the given triangle is 5 : 4, find the perimeter
of the given triangle.​

Answer 1

Let x,y,z be the sides
Perimeter = x+y+z
When each side increases by 10
Perimeter = x+10+y+10+z+10
= P(initial) + 30
P+30/P = 5/4
4P+120 = 5P
P = 120

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