Question 267902
I don't think you are hopeless at all, how about a step-by-step method here?
Let x = the largest angle
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"the largest angle is 100 degrees greater than the smallest angle."
(x-100) = the smallest angle
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"The largest angle is three times as large as the third angle."
{{{1/3}}}x = the 3rd angle

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Now we have an expression for all 3 angles using x
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What is the measure of each angle?
I'm sure you know that a triangle has a total of 180 degrees
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Large + small + 3rd angle = 180
x + (x-100) + {{{1/3}}}x  = 180
2x + {{{1/3}}}x - 100 = 180
2x + {{{1/3}}}x = 180 + 100
2x + {{{1/3}}}x  = 280
Multiply by 3 to get rid of the denominator, results
3(2x) + x = 3(280)
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6x + x = 840
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7x = 840
x = {{{840/7}}}
x = 120 degrees is the largest angle
then
{{{1/3}}} * 120 = 40 degrees is the 3rd angle
and
120 - 100 = 20 degrees is the smallest angle
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Check our answers
120 + 40 + 20 = 180 degrees
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Hope this relieves you of that hopeless feeling!! 
If you have any questions about this, you can email me.  ankor@att.net