A pencil costs $0.25 more than an eraser. if the cost of eight pencils is $6.80, what is the cost of one eraser?

Cost of pencil = x+0.25

Cost of eraser = x

Cost of 8 pencil = 6.80

Cost of 1 pencil = 6.80/8 = 0.85

So the cost of eraser

0.85 = x+0.25 (cost of 1 pencil)

0.85-0.25 = x

0.6 = x

So the cost of eraser is $ 0.6

Cost of Pencil $6.80 / 8

= $0.85

Cost of eraser

$0.85 - $0.25

= $0.60