Answer: 2400
Step-by-step explanation:
Step 1: Add the numbers together so 8+15+20.
Step 2: Take the sum and multiply by 3.
Step 3: The cube root of 8 to that number and add 20 minus 15.
Step 4: Then add the factorial of 5 to that number.
Step 5: Final step,
.
For more information on this please look up the Japanese mathematician Itadaki Seiki.