Question

. The cost of 7 chairs is 840. Compute the cost of 9 chairs and 12 chairs of the same type.​

Answer 1

cost of 7 chairs= 840

cost of 1 chair=840/7

= 120

cost of 9 chairs =120×9

= 1080

cost of 12 chairs= 120×12

= 1440

Answer 2

Cost of 7 chairs = Rs. 840

cost of one chair =

$\frac{840}{7 }$

= Rs 120

Cost of 9 chairs = 120 × 9 = Rs. 1080

cost of 12 chairs = 120 × 12 = Rs. 1440