Question

Vijaya wanted to gift pens to seven of her friends on her birthday. When she went to a shop to buy them, the shopkeeper told her the rate for a dozen pens. 

i. Can you help Vijaya to find the cost of 7 pens? 

ii. If you find the cost of one pen, you can also find the cost of 7, right?

Answer 1

Cost of 12 pens = Rs 84. 

∴ Cost of 12 pens

∴ Cost of 7 pens = Cost of one pen x Number of pens = 7 × 7

∴ Cost of 7 pens = Rs 49

∴ The cost of 7 pens (Rs 49) can be found by unitary method.