SOLUTION: the lenght of the base of an isosceles triangle is 20 less than three times the lenght of its legs.what is the lenght of the baseif the perimeter is 280 cm?

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Question 209016: the lenght of the base of an isosceles triangle is 20 less than three times the lenght of its legs.what is the lenght of the baseif the perimeter is 280 cm?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
base=160
legs=60
3x-20+2x+280
5x=300
x=60