Question 1007253
Let x be the first side
Let y be the second side
Let z be the third side

x = 2y - 65
z = y - 10

x + y + z = 165
(2y -65) + y + (y-10) = 165
4y -75 = 165
4y = 240
y = 60

x = 2y - 65 = 2(60) - 65 = 55
z = y - 10 = 60 - 10 = 50

Equation: (2y -65) + y + (y-10) = 165
Final Answer: 
First side = 55 cm
Second side = 60 cm
Third Side = 50 cm