Question

lf 'x' means '-', '-' means '+', '/' means 'x', and '+' means '÷', which of the following is correct?

• A. 20 + 4-2 × 5 = 10
• B. 15 - 3 + 6/2 = 12
• C. 48 / 8 + 3-5 × 1 = 15
• D. 10 × 2-4+8/2=9

Answer 1

Answer:

D. 10 × 2-4+8/2=9

Given:

• × means −

• − means +

• / means ×

• + means ÷

Substitute the symbols and evaluate each expression using the normal order of operations.

1. 20 + 4 − 2 × 5 = 10
   → 20 ÷ 4 + 2 − 5
   = 5 + 2 − 5 = 2

2. 15 − 3 + 6 / 2 = 12
   → 15 + 3 ÷ 6 × 2
   = 15 + (3 ÷ 6 × 2) = 15 + 1 = 16

3. 48 / 8 + 3 − 5 × 1 = 15
   → 48 × 8 ÷ 3 + 5 − 1
   = 384 ÷ 3 + 5 − 1 = 128 + 5 − 1 = 132

4. 10 × 2 − 4 + 8 / 2 = 9
   → 10 − 2 + 4 ÷ 8 × 2
   = 10 − 2 + (4 ÷ 8 × 2) = 8 + 1 = 9

Correct answer: Option 4.