the sides of a triangle are in the ratio 5 : 12 : 13 and its perimeter is 480 m , its area is ?
"5 x + 12 x + 13 x = 480 = > x = 16 a = 80 , b = 192 , c = 208 s = ( 80 + 192 + 208 ) / 2 = 240 answer : b"
multiply(480, divide(480, add(add(5, 12), 13)))