book Maths Puzzle Numerical Ability

In the diagram above, if O is the centre of the circle, then y=

(A) 25 degrees
(B) 80 degrees
(C) 90 degrees
(D) 100 degrees

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book Other Question

On a road map with a scale of 1/4 inch per 10 miles, the highway from Waukee to Winterset is 1 2/5 inches long. How many miles long is this highway? express as the confunction of a positive acute angle not using a calculator of ctn 250 degrees.