Question

7. The cost of a pen is ₹ 4 more than a cost of a note-book. The total cost of 4 pens and 6 notebooks is ₹ 106
Find the cost of one pen and one note-book.​

Answer 1

Answer:

22

Step-by-step explanation:

Let pen be x and notebook be y

from 1st condition

x- 4 = y..... 1

from 2nd condition

4x+6y= 106..... 2

substitute 1 in 2

4x+6(x-4)=106

4x+6x-24=106

10x = 130

x = 13

put x = 13 in 1

13-4 = y

y =9

cost of one pen and one notebook

x+y

13+9

22

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Answer 2

Step-by-step explanation:

let the cost of notebook be x

similarly cost of a pen be y+4

first condition

x=y+4

and second

4(y+4)+6x=106

substitute equation 1 in equation 2

4y+16+6(y+4)=106

4y+16+24+6y=106

10y=106-40

10y=66

y=6.6

similarly x=6.6+4=10.4

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