Question

Total cost of a pen and a book is Rs.19. If the cost of a book is Rs.5 more than that of a pen. Find the cost of a book and a pen​

Answer 1

Answer:

x + (x + 4) = 20

Solve for ‘x’:—

x + (x + 4) = 20

2x + 4 = 20

2x = 20 – 4

2x = 16

x = 16 / 2 = 8

Step-by-step explanation:

Answer 2

Answer:

Question:- Total cost of a pen and a book is Rs.19. If the cost of a book is Rs.5 more than that of a pen. Find the cost of a book and a pen

Solution:-

Let the cost of pen be

cost of book=x+5

therefore we've to form an equation from the data

that is

x+(x+5)=19

2x+5=19

2x=19-5=14

x=14/2

x=7

There the Cost of :-

Book = x+5=7+5=12

Pen=x=7

Let's check whether it's correct or not

(x+5)+x=19

12+7=19

19=19

L.H.S=R.H.S

hence verified