On a test consisting of 30 questions. No. of wrong answers is 50% less than number of right answers. Each answer was either right or wrong. What is the ratio of right answers to wrong answers?  Choose the correct choice:	A) 1 : 3	B) 2 : 3	C) 2 : 1	D) 3 : 5	E) 3 : 7
Sol. Let the number of wrong answer - x and number of right answer = 30-x x = 50/100 of (30-x) x = 10   Required ratio = 20 : 10 = 2 : 1   2 : 1
<result>C</result>
On a test consisting of 30 questions. No. of wrong answers is 50% less than number of right answers. Each answer was either right or wrong. What is the ratio of right answers to wrong answers?