The sum of three numbers is 67. If the ratio of the first number to the second number is 3 : 5 and that of the second number to the third number is 4 : 7, then what is the second number ?
A dealer marks his goods 20% above their cost prices. Then,he allows such a discount on the marked price so that he makes a profit of 8%. The rate of discount is:
In an examination, 35% of total students failed in Hindi, 45% failed in English and 20% failed in both. Find the percentage of those studnets who passed in both the subjects ?