**Concept: The question tests on the basics of framing and solving equations**

**Solution:**

Let the price per unit of desks be d and that of chairs be c

Total cost of 3 desks and 1 chair= 3d + c

Total cost of 1 desk and 3 chairs = d + 3c

According to the question,

3d + c = 2(d+3c)

=>d=5c

Total cost of 4 desks and 1 chair =4d + c = X

Total cost of 1 desk and 4 chairs = d +4c =Y

We need to find X is how many times Y??

=>X/Y = 4d + c / d + 4c

=> 4(5c) + c / 5c+ 4c

= 21/9

=7/3

=>X/Y =7/3 = > X is 7/3 times Y (option e)

For questions on Inequalities, analyze the parts in the question stem and break them down to form an equation.