Question

The cost of an pencil is rs 25 more than the cost of an eraser . If the cost of 8 pencils and 10 eraser is rs 12.80 , find the cost of each

Answer 1

Answer:

Pencil Eraser

25+x x

8(25+x)+10x=1280 [ 1 doller=100 cent

12.80 doller=1280 cent

200+8x+10x=1280

200+18x=1280

18x=1280-200

18x=1080

X=1080/18

X=60

Cost of a eraser= x = 60

Cost of a pencil= 25+x=85

Answer 2

Answer:

let the cost of the eraser be x and the pencil be x + .25

according to the question

8( x + .25 ) + 10x = 12.80

8x + 2 + 10x = 12.80

8x + 10x + 2 = 12.80

18x + 2 = 12.80

18x = 12.80 - 2

18x = 10.80

x = .60

so, the cost of the eraser is x = .60 cents

the cost of the pencil is x + .25 = .60 + .25 = .85 cents