A piece of cloth cost Rs.35. If the length of the piece would have been 4m longer and each meter cost Rs. 1 less, the cost would have remained unchanged. How long is the piece?
Q1. A piece of cloth cost Rs.35. If the length of the piece would have been 4m longer and each meter cost Rs. 1 less, the cost would have remained unchanged. How long is the piece?
Answer: 10
Explanation: Let length = L metres at cost 35/L per metre; (L+4)(35/L − 1) = 35 gives L² + 4L − 140 = 0, solving yields L = 10.