Question

25[10+ {20-3(7-5-3))}]​

Answer 1

825. Also you use wrong the order of brackets...

Explanation:

25{10+[20-3(7-5-3)]}=25{10+[20-3x(-1)]}=25{10+23}=25x33=825.

We try to solve in order from (...) then [...] and final is {...}