Explanation:

Let’s break down each option for the equation:

\(28 + 49 - 35 \div 7 \times 4 = 68\)

- First, solve as is:

\(35 \div 7 = 5\)

\(5 \times 4 = 20\)

So, equation is: \(28 + 49 - 20 = 57\)

Not equal to 68.

Now, let's check each option:

- Option 1: Swap 28 and 35:

New equation: \(35 + 49 - 28 \div 7 \times 4\)

\(28 \div 7 = 4\)

\(4 \times 4 = 16\)

\(35 + 49 - 16 = 68\)

This works!

- Option 2: Swap 28 and 49:

New equation: \(49 + 28 - 35 \div 7 \times 4\)

\(35 \div 7 = 5\)

\(5 \times 4 = 20\)

\(49 + 28 - 20 = 57\)

No.

- Option 3: Swap 49 and 35:

New equation: \(28 + 35 - 49 \div 7 \times 4\)

\(49 \div 7 = 7\)

\(7 \times 4 = 28\)

\(28 + 35 - 28 = 35\)

Not correct.

- Option 4: Swap 4 and 28:

New equation: \(4 + 49 - 35 \div 7 \times 28\)

\(35 \div 7 = 5\)

\(5 \times 28 = 140\)

\(4 + 49 - 140 = -87\)

Not correct.

So, the correct option is Option 1: Swap 28 and 35.