WAEC - Mathematics (2010 - No. 38)

What is the value of m in the diagram?

20^o

30^o

40^o

50^o

4m - 15^o = m + 75^o

(Vertically opposite angles are equal)

4m - m = 75 + 15

3m = 90

m = \(\frac{90}{3}\)

m = 30^o