Problem
For quadrilateral JKLM, shown below, \( \mathrm{m} \angle \mathrm{KLM}=(2 x)^{\circ} \) and \( \mathrm{m} \angle \mathrm{LMJ}=(4 x)^{\circ} \). What is the value of \( x \) ? 15 30 60 75
Solution
Step 1 ：\(\mathrm{m}\angle\mathrm{KLM} + \mathrm{m}\angle\mathrm{LMJ} = 180^{\circ}\)
Step 2 ：\(2x + 4x = 180\)
Step 3 ：\(6x = 180\)
Step 4 ：\(x = 30\)
