a number is doubled and 8 is added . if the resultant is trebled , it becomes 84 . what is that number ?
"solution let the number be x . then , 3 ( 2 x + 8 ) ‹ = › 84 ‹ = › 2 x + 8 = 28 ‹ = › 2 x = 20 x = 10 . answer a"
divide(subtract(84, multiply(const_3, 8)), multiply(const_3, const_2))