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The values of three angles at a point are 3y - 45o, y + 25o...

Mathematics
WAEC 2006

The values of three angles at a point are 3y - 45o, y + 25o and yo . Find the value of y.
  • A. 40o
  • B. 58o
  • C. 68o
  • D. 76o
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Correct Answer: Option D
Explanation
(3y - 450 + (y + 25) + t = 360o(angles at a point)

3y - 45 + y + 25 + y = 360

5y = 360 + 20

5y = 380

y = \(\frac{380}{5}\)

= 76o

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