General Studies · Mathematical Operations
यदि '+' और '-' को आपस में बदल दिया जाए, तथा '×' और '÷' को आपस में बदल दिया जाए, तो निम्नलिखित समीकरण में प्रश्न चिह्न (?) के स्थान पर क्या आएगा? 12 ÷ 4 + 20 × 5 - 7 = ?
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