if cost of 5 pens and 7 books is Rs.150 then find the cost of 15 pens and 21 books. ​

2 thoughts on “if cost of 5 pens and 7 books is Rs.150 then find the cost of 15 pens and 21 books. ​”

1. Answer:

   rs 450

   5×3=15

   7×3=21

   So,150×3= 450

   please mark my answer as brainleast

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2. Answer:

   450

   Step-by-step explanation:

   ATQ

   5 PEN + 7 BOOK = 150

   15 PEN + 21 BOOK = ?

   3 is common in above equation

   3 (5 pen + 7 books)

   Putting value from question so,

   3 X 150

   = 450 rs.

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