Starting from his house, Manish moves 25 km towards southeast and then turns to the west and covers another 7 km. How far (in kilometres) is he now from his house?
In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question? 642 x 6 ÷ 25 + 4 = ?