Question

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

Answer 1

Answer:

rs 450

5x3=15

7x3=21

So,150x3= 450

please mark my answer as brainleast

Answer 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.