15 + 120 = 135
12 + 15 + 63 + 12 + 24 + 34 + 23 + 15 = 198
57
15 +26+9+12
15 + 12 + 17 = 44
20
3 + 11 + 11 + 11 + 12 + 13 + 15 + 15 + 16 + 17 + 19 = 143
12 + 15% = 12.1512% + 15% = 27%13.8 is 15% greater than 12.
1+12=13+15=28+2=30+29=59.
12 + 3 = 15
12.
-3