Explanation:

Let’s break it down:

- The original: 64 – 8 ÷ 3 + 7 × 5

- Order of operations says: do ÷ and × first, then – and +.

- So: 8 ÷ 3 ˜ 2.67; 7 × 5 = 35. Plug those in:

- 64 – 2.67 + 35 ˜ 96.33—not 40.

Now, check each option:

1. Change ÷ and –.?

- That makes it: 64 + 8 × 3 + 7 × 5

- 8 × 3 = 24; 7 × 5 = 35

- 64 + 24 + 35 = 123. Nope.

2. Change × and ÷.

- So: 64 – 8 × 3 + 7 ÷ 5

- 8 × 3 = 24; 7 ÷ 5 = 1.4

- 64 – 24 + 1.4 = 41.4. Not 40.

3. Change × and +.

- 64 – 8 ÷ 3 × 7 + 5

- 8 ÷ 3 = 2.67

- 2.67 × 7 ˜ 18.67

- 64 – 18.67 + 5 = 50.33. No.

4. Change ÷ and +

- 64 – 8 + 3 + 7 × 5

- 7 × 5 = 35

- 64 – 8 + 3 + 35

- 56 + 3 + 35 = 94.

- Still wrong.

But, wait: Maybe flip ÷ to – and – to ÷ (per how the option 1 is phrased):

- Try this: 64 ÷ 8 – 3 + 7 × 5

- 64 ÷ 8 = 8; 7 × 5 = 35; 8 – 3 = 5; 5 + 35 = 40.

Now we have 40. That matches the right side.

So, Option 1 is correct: change ÷ and – (÷ and –).