Question

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

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Step-by-step explanation:

Let the side of triangle be x

perimeter of triangle=x+x+x=3x

perimeter of new triangle=3(x+5)

$\frac{3x}{3(x + 5)} = \frac{4}{5} \\ 15x = 12(x + 5) \\ 15x = 12x + 60 \\ 15x - 12x = 60 \\ 3x = 60 \\ x = \frac{60}{3} \\ x = 20$

perimeter of triangle=3x=3×20=60cm