If two adjacent angles of a parallelogram

Question:

If two adjacent angles of a parallelogram are (5x – 5)o and (10x + 35)o, then the ratio of these angles is

(a) 1 : 3

(b) 2 : 3

(c) 1 : 4

(d) 1 : 2

Solution:

(a) 1: 3

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