निम्नलिखित समीकरण को सही बनाने के लिए किन दो संख्याओं और दो चिह्नों को आपस में बदला जाना चाहिए? 4 + 2 ÷ 7 + 8 × 9 = 25

If '+' is interchanged with '-' and '×' is interchanged with '÷', what will come in place of '?' in the following equation? 529 ÷ 23 + 89 - 12 × 9 = ?

By interchanging which two signs will the given equation become correct? 15 - 9 ÷ 6 × 10 + 5 = 25