Question

The cost of 1 pencil and 3 erasers is rs.10and the cost of 4 pencils and 6 erasers is rs.28.find the cost of 5pencils and 4 erasers

Answer 1

cost of 5 pencil is Rs 20
cost of 4 erasers is Rs 8

Answer 2

hii mate,

let,

Pencil- x

Eraser- y

Quesionly

x+3y=10 ....(1)

again questionly

4x+6y=28 ....(2)

than in (1)in multiply by 6 and in (2)x3

6x+18y=60

12x+18y=84

----------------(subtract)

-6x =-24

x =24/6

x =4

value of x putt in (1)

4+3y=10

3y=6

y=2

than 5 pencil and 4 eraser rate is

5x4+4x2

20+8

28

so 5 pencil and 4 eraser rate 28 rs.