15. Five marks exercise problems X

In $\Delta RST$, $\angle S$ is $10^\circ$ greater than $\angle R$ and $\angle T$ is $5^\circ$ less than $\angle S$, find the three angles of the triangle.

 

$\angle R$ $=$ $^\circ$

 

$\angle S$ $=$ $^\circ$

 

$\angle T$ $=$ $^\circ$