Question

 the cost of 5 chairs and 3 mugs is Rs 1900, and the cost of 8 chairs and 5 mugs is Rs 2900, what is the cost of 5 chairs and 8 mugs?

Answer 1

the answer is2900rs because 8chars and5mugs is 2900rs.then 5chairs and 8mugs is also 2900rs

Answer 2

Let us assume, the cost of the chair is Rs x and cost of the mug is Rs y.

Therefore,

given:
5x + 3y = 1900 -----------1 and

8x + 5y = 2900 -----------2

Multiply equation 1 by 8 and equation 3 by 5

40x + 24y = 15200 ------------3 and

40x + 25y = 14500 ------------4

Subtract equation 4 from equation 3

-y = 700 therefore, y = -700 Rs

Your question itself is wrong because the cost can never be negative. So please revise the question.