Question 467633
The smallest angle is 10 degrees
So that if the largest angle is 9 times larger than the smallest one it equals 90. (10*9) 
Then the third angle is 70 degrees larger...so letting the smallest angle represent x.... (70+x) 

Largest angle: 10*9=90
Smallest angle: 10
Third angel:70+10=80

Total: 90+10+80=180

Guess and check to figure out what the measurement of the smallest angle is, and once you make a logical guess plug it back in and see if it equals 180.