If 'Δ' means '+', '□' means '×', '○' means '÷', and '∇' means '-', then find the value of 20 ○ 4□8Δ10∇15.
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Correct answer: C
Explanation
Given symbol representations:
• '○' represents '÷'
• '□' represents '×'
• 'Δ' represents '+'
• '∇' represents '-'
Given expression:
20 ○ 4 □ 8 Δ 10 ∇ 15
Substitute the actual mathematical symbols into the expression:
= 20 ÷ 4 × 8 + 10 - 15
Applying the BODMAS rule:
• Division: 20 ÷ 4 = 5
• Multiplication: 5 × 8 = 40
• Addition: 40 + 10 = 50
• Subtraction: 50 - 15 = 35
Therefore, the correct answer is (C) 35.