the perimeter of an equilateral triangle is 60 . if one of the sides of the equilateral triangle is the side of an isosceles triangle of perimeter 70 , then how long is the base of isosceles triangle ?
"the base of the isosceles triangle is 70 - 20 - 20 = 30 units the answer is d ."
subtract(subtract(70, divide(60, const_3)), divide(60, const_3))