let cost of 1 chair be xRs. and 1table be yRs.

3chairs and 1 table cost 1000 Rs

thus 3x+y=1000

similarly, 6x+y=2500

Following observations are given

At what rate percent per annum w

The ratio between rs 2.50 to rs

What is the HCF of a²-b²-c²+2ab

The present ages of rohan and So

Simplify( 5^0+7^0) ÷ ( 2^0+3^0)p