tomemos al ángulo "a" y "b"
a = 2b/3 + 15
b = b
además
a + b = 180
entonces, reemplazando
2b/3 + 15 + b = 180
2b + 45 + 3b = 540
5b + 45 = 540
5b = 495
b = 99
entonces, el valor de a es
a = 2(99)/3 + 15
a = 2 * 33 + 15
a = 66 + 15
a = 81
te pide hallar el valor del ángulo agudo, entonces
Rpta: 81°
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tomemos al ángulo "a" y "b"
a = 2b/3 + 15
b = b
además
a + b = 180
entonces, reemplazando
a + b = 180
2b/3 + 15 + b = 180
2b + 45 + 3b = 540
5b + 45 = 540
5b = 495
b = 99
entonces, el valor de a es
a = 2(99)/3 + 15
a = 2 * 33 + 15
a = 66 + 15
a = 81
te pide hallar el valor del ángulo agudo, entonces
Rpta: 81°