In the figure, AD and BC are lines intersecting at O. What is the value of a?
Solution
Correct Answer: Option C
এখানে,
5x + 5a = 5y/2
⇒ x + a = y/2
⇒ 2x + 2a = y
আবার, 5x + 5a + 2x + 30 = 180
⇒ 7x + 5a = 150
আবার, y = 2x + 30
⇒ 2x + 2a = 2x + 30
⇒ 2a = 30
⇒ a = 15
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