1.  The price of 10 chairs is equal to that of 4 tables. The price of 15 chairs and 2 tables together is ₹ 4000. The total price of 12 chairs and 3 tables is:
A. ₹ 3500
B. ₹ 3750
C. ₹ 3840
D. ₹ 3900

Answer: Option D

Explanation:

Let the cost of a chair and that of a table be ₹ x and Rs. y respectively.

Then, 10x = 4y   or   y = 5 x.
2

15x + 2y = 4000

15x + 2 x 5 x = 4000
2

20x = 4000

x = 200.

So, y = 5 x 200 = 500.
2

Hence, the cost of 12 chairs and 3 tables = 12x + 3y

    = ₹ (2400 + 1500)

    =₹ 3900.