what is the sum of

25,-5,-10,15,10

25+[-5]+[-10]+15+10

25-5-10+15+10

20-10+15+10

10+15+10

25+10

35 ans...

25+[-5]+15+10

25+[-5]

25-5

20+15=35

35+10=45

45+[-10]

45-10=35

ans=35