Question

The price of 4 pencils is equal to that of 10pens.The price of 2 pens and 15pencils is ₹4000.Whats is the cost of 12 pens and 3pencil?

Answer 1

Step-by-step explanation:

cost of 1 pencil be x and 1 pen be y

condition 1 : 4x = 10y ÷ 2

2x = 5y

condition 2 : 2x + 15y = 4000

5y + 15y = 4000

20y = 4000

y = 200

2x = 5y

2x = 5×200

2x = 1000

x = 500

therefore the cost 1 pencil is ₹500 and

1 pen is ₹200

1pencil = 500

→3pencils = 500 × 3 = 1500

1 pen = 200

→12 pens = 200 × 12 = 2400

12pens + 3 pencils

→ 2400 +. 1500 = 3900

cost of 12 pens is ₹2400

cost of 3 pencils is ₹1500

→cost of 12 pens and 3 pencils is ₹3900

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