Question

What will be the total cost of 25 pens and 30 pencils if the cost of 45 pens and 20 pencils are Rs. 900 and Rs. 160 respectively?

Answer 1

Cost of 45 pens = ₹900

Cost of 1 pen = 900/45 = ₹20

So, cost of 25 pens = 25 × 20 = ₹500

Cost of 20 pencils = ₹160

Cost of 1 pencil = ₹8

So, cost of 30 pencils = 30 × 8 = ₹240

Therefore, total cost = 500 + 240 = Rs. 740