Question

if one side of a triangle is one third of the perimeter ,the second side is one fifth of the perimeter ,and the third side is 7 metres ,what is the perimeter of triangle​

Answer 1

Answer:

15

Step-by-step explanation:

Let the perimeter of triangle =x

$\frac{1}{3} x + \frac{1}{5} x + 7 = x$

$\frac{x}{3} + \frac{x}{5} + 7 = x$

$\frac{5x + 3x + 105}{15} = x \\ 8x + 105 = 15x \\ 105 = 15x - 8x \\ 7x = 105 \\ x = \frac{105}{7} \\ x = 15$

Answer 2

Answer:

Perimeter=15

Step-by-step explanation:

Let the perimeter be X

according to question

X= X/3 + X/5+7

X=5x+3x+105/15

15x=8x+105

15x-8p=105

7x=105

X=105÷7

X=15

Hence,the perimeter of the triangle is 15m