The value of $40 \div 5$ of $2 \times[18 \div 6 \times(12-9)$ of $5-(3-8)] \div 25$ is:

5 7 8 4

8

Using BODMAS rule = 40 ÷ 5 of 2 × [18 ÷ 6 × (12 − 9) of 5 − (3 − 8)] ÷ 25 = 40 ÷ 10 × [18 ÷ 6 × 3 of 5 − (- 5)] ÷ 25 = 4 × [18 ÷ 6 × 3 of 5 + 5] ÷ 25 = 4 × [18 ÷ 6 × 15 + 5] ÷ 25 = 4 × [3 × 15 + 5] ÷ 25 = 4 × [45 + 5] ÷ 25 = 4 × 50 ÷ 25 = 4 × 2 = 8