Question

5pens and 1 book together cost ₹225.cost of 10 pens is equal to the cost of 1book.find the total cost of 3pens and 2books

Answer 1

5 pens + 1 book = Rs 225-------- equation [ 1 ]

10 pens = 1 book

⇒ 1 book = 10 pens -------- Sub into equation [ 1 ]

5 pens + 10 pens = Rs 225

15 pens = Rs 225

1 pen = 225 ÷ 15

1 pen = Rs 15 -------- Sub into equation [ 1 ]

5(15) + 1 book = 225

75 + 1 book = 225

1 book = 225 - 75

1 book = Rs 150

Find the cost of 3 pens and 2 books:

3 pens + 2 books = 3(15) + 2(150)

3 pens + 2 books = Rs 345

Answer: 3 pens and 2 books cost Rs 345