Let the cost of a chair and that of a table be Rs.
x and Rs.
y respectively.
Then, 10x = 4y or y = |
5 |
x. |
2 |
∴ 15x + 2y = 4000
⟹ 20x = 4000
∴ x = 200.
So, y = |
❨ |
5 |
x 200 |
❩ |
= 500. |
2 |
Hence, the cost of 12 chairs and 3 tables = 12x + 3y
= Rs. (2400 + 1500)
= Rs. 3900.