Instead of -25 plus - 16, think of it as -25 - 16. 25 mins 16 equals -41.
25 + 16 + 19 = 60
75 + 16 + 25 = 116
33 + 25 + 16 = 74
25+16+12+42+20=115
1 + 4 + 16 + 25 + 36 + 49 = 131
Yes and 9+16 = 25
16 + 9 = 25
16
No, consider 16 + 25 ...
n + 16 = 25 Subtract '16' from both sides. n + 16 - 16 = 25 - 16 Collect terms n = 9
90