a scale 6 ft . 8 inches long is divided into 4 equal parts . find the length of each part
"explanation : total length of scale in inches = ( 6 * 12 ) + 8 = 80 inches length of each of the 4 parts = 80 / 4 = 20 inches answer : b"
divide(add(multiply(6, const_12), 8), 4)