Question 161209
Let X be the first angle. You are told the second angle is X/2. The third angle is X+10.

{{{X + X/2 + (X+10) = 180}}}
{{{5X/2 = 170}}}
{{{5X = 340}}}
{{{X = 68}}}
That means the second angle is {{{68/2}}} = {{{34}}}
The third angle is {{{68+10}}} = {{{78}}}
Do those three total to 180?