You would do better to call the School Subject MATH.
"i am a 3 digit number"
3 digit number = XYZ
"divisible by 3"
(X+Y+Z)/3 = whole number
"my tens digit is 3 times as great as my hundreds digit"
therefore,(X+3X+Z)/3 = whole number
"the sum of my digits is 15"
X+Y+Z=15 or X+3X+Z=15 (from substitution of Y=3X) or Z=15-4X
"if you reverse my digits i am divisible by 6"
which means it's divisible by 2!
X = 0, 2, 4, 6, or 8
plug X into here:
(X+3X+Z)/3 = whole number
see which ones work!
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