Jane spent the same amount of money on 10 pencils and 14 erasers. Each pencil cost 20 cents more than each eraser. Find the cost of one eraser.
Let x be the amount for the eraser. 10(x + 20) = 14x ===> 10x + 200 = 14x. Solving gives x = 50 (in cents), so the amount should be 50 cents.