Answer: 3
Step-by-step explanation:
In the given figure , we have a triangle with side lengths 3t, 4t , 7t+6.
Also, the perimeter of triangle is given to be 48 units.
[Perimeter is the sum of all sides.]
Subtract 6 from both the sides , we get

Divide 14 from both the sides , we get

Hence, the value of t =3