One number is 50% less than X and another number is 20 percent less than X. What is the ratio of both the numbers?

If $$ {3^{4x-y}={3^{x+y}=\sqrt{27}}}$$,  then the value of y is:

The monthly salaries of A, B and C are in the ratio 2 : 3 : 5. If C's monthly salary is ₹ 12,000 more than that of A, then B's annual salary is 

If the ratio of selling price and cost price is 4:5 respectively, then what is the loss percentage?

16 men can complete a piece of work in 7 days. In how many days will 28 men complete the same work?

3400 Rupees is divided among A, B, C, D in such a way that the share of A and B, B and C, C and D may be as 2:3, 4:3 and 2:3 respectively. The sum of shares of B and D is:

A train passed by a man standing on the platform in 7 seconds and passed by the platform completely in 28 seconds. If the length of the platform is 330 metres, what is the length of the train?

The average age of 30 boys in a class is 15 years. One boy, aged 20 years, left the class, but two new boys came in his place whose age differs by 5 years. If the average age of all the boys now in the class becomes 15 years, the age of the younger newcomer is: