If '+' means '×', '−' means '÷', '×' means '+' and '÷' means '−', then which one of the following equations is correct?

If "No scientists are philosophers" is true, which one of the following propositions is true?

Find the correct alternative from the following : Ocean : Pacific : : Island : ?

Which one of the following years will have the same calender as of 2009?

Complete the following series with the correct option : 3, 2, 6, 8, 18, 40, ?

If '+' means '÷', '−' means '×', '×' means '+' and '÷' means '−', then 6 ÷ 10 − 4 × 12 + 6 = ?