JAMB Mathematics 2018 Objective — Question 29

Question 29 of 39 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2018 Objective paper, with the correct answer and a full explanation.

If the angles of a quadrilateral are (3y+10)°, (2y+30)°, (y+20)° and 4y°, find the value of y

A. 66°
B. 12°
C. 30°Correct
D. 45°

Explanation

Sum of angles in a quadrilateral = 360°. (3y+10)+(2y+30)+(y+20)+4y=360 → 10y+60=360 → y=30.

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