well if you get -3 and 15 you will have a answer of 5
if you want to be more harder what is 15 to -3
i am just saying
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a - 15 = 3 a - 15 + 15 = 3 + 15 a = 18
4/12 + 3/15 = 4x1/4x3 + 3/15 = 1/3 + 3/15 = 1x5/3x5 + 3/15 = 5/15 + 3/15 = 8/15
3/15 of 15 is 3
15*1/3= 15/1*1/3= 15*1=15 1*3=3 15/3=5 15*1/3=5 I hope I helped.
3/20=.15 .15*100=15%