What will come in the place of '?' in the following equation, if '+' and '−' are interchanged, '×' and '÷' are interchanged and '4' and '8' are interchanged? (Note: Consider the entire number while interchanging; do not interchange individual digits - part of larger numbers.) 24 × 8 − 18 ÷ 4 + 5 = ?
145
Apply all three interchanges to the original expression. '×' becomes '÷', '÷' becomes '×', '−' becomes '+', '+' becomes '−', and the whole numbers 4 and 8 swap with each other.
Original: 24 × 8 − 18 ÷ 4 + 5. After swapping operators and the numbers 4 and 8, it becomes: 24 ÷ 4 + 18 × 8 − 5.
Evaluate using BODMAS. Division first: 24 ÷ 4 = 6. Multiplication next: 18 × 8 = 144. Now: 6 + 144 − 5 = 150 − 5 = 145.
Hence, the correct answer is 145.
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