if 2 x + y = 10 , 2 y + z = 20 and 2 x + z = 30 . where x , y , and z are real number . what is the value of 2 x ?
"explanation : let , 2 x = a , 2 y = b and 2 z = c then from the question : 2 x + y = 2 x * 2 y = ab = 10 similarly , bc = 20 , ac = 30 ab / bc = 1 / 2 = > a / c = 1 / 2 and ac = 30 ( a / c ) * ac = 1 / 2 * 30 = 15 a = sqrt ( 15 ) answer : b"
divide(subtract(10, divide(add(multiply(subtract(multiply(20, 2), 2), 2), 10), add(multiply(multiply(2, 2), 2), const_1))), 2)