Question

It 12 chairs cost 3360 then the cost of 30 chairs
is ................ when rate of each chair is the same,​

Answer 1

Answer:

If 15 chairs and 12 tables cost Rs 33600, and the cost of two chairs is Rs 640, what are the costs of 12 chairs and 3 tables?

Statement of the given problem,

If 15 chairs and 12 tables cost Rs 33600, and the cost of two chairs is Rs 640, what are the costs of 12 chairs and 3 tables?

Let C & T denote cost prices of a chair & a table respectively.

Hence from above data we get following relations,

15*C + 12*T = 33600

or 5*C + 4*T = 11200 …… (1a)

2*C = 640 or C = 320 (Rs) …… (1b)

From (1a) & (1b) we get,

4*T = 11200 - 5*320

or T = 9600/4 = 2400 (Rs) …… (1c)

Therefore from (1b) & (1c) we get the required cost of

12 chairs and 3 tables = 12*320 + 3*2400 = 11040 (Rs) [Ans]

Step-by-step explanation:

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Answer 2

Answer:

Solved by Unitary method

Cost of 12 chairs = ₹ 3360

Cost of 1 chair = ₹ 3360 ÷ 12

= ₹ 280

Cost of 30 chairs = ₹ 280

= ₹ 280  × 30

= ₹ 8400

Hence, the cost of 30 chairs would be ₹ 8,400

Hope it helps