Question
Fabian used 3 elastic bands to form the sides of triangle RST where RS = 9 cm, ST = y cm and RT = 3y cm. Jack stretches two of the elastic bands and enlarges triangle RST. The sides ST and RT are stretched to 4 times its original length. What is the perimeter of the stretched triangle RST?
2 m

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Fabian used 3 elastic bands to form the sides of triangle RST where RS = 9 cm, ST = y cm and RT = 3y cm. Jack stretches two of the elastic bands and enlarges triangle RST. The sides ST and RT are stretched to 4 times its original length. What is the perimeter of the stretched triangle RST?