Which interchange of two signs makes the equation $18 \div 3 \times 2 + 4 - 6 = 28$ correct?

Explanation

1. 01

   As written, the left side is $6 \times 2 + 4 - 6 = 10$, not 28.

2. 02

   Interchange − and ×: $18 \div 3 - 2 + 4 \times 6 = 6 - 2 + 24 = 28$. This works.

3. 03

   Check the others: + and − gives $12 - 4 + 6 = 14$; + and × gives $6 + 2 \times 4 - 6 = 8$; × and ÷ gives $18 \times 3 \div 2 + 4 - 6 = 25$.

4. 04

   Only interchanging − and × gives 28.