Question

In ΔRST, \text{m}\angle R = (6x10)^{\circ}m∠R=(6x10) ∘ , \text{m}\angle S = (2x5)^{\circ}m∠S=(2x5) ∘ , and \text{m}\angle T = (3x-11)^{\circ}m∠T=(3x−11) ∘. Find \text{m}\angle R. M∠R