What is the comprehensive formula of 15 + 35 = 50, 50 * 3 = 150, 3000 divided by 150 Give the right answer

What is the comprehensive formula of 15 + 35 = 50, 50 * 3 = 150, 3000 divided by 150 Give the right answer

3000÷[(15+35)×3]=20
The one upstairs is wrong
Just push it backwards
I hope I can help you