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want. It

is a

problem in

arithmetic.”

“What do

you mean

by a

problem in

arithmetic？”

asked the

man.

“Well，if

six apples

are worth

five

cents，then

five

apples are

worth four

cents，four

apples are

worth

three

cents，three

apples are

worth two

cents，two

apples are

worth one

cent and

one apple

is worth

nothing. I

only want

one

apple，and

if one

apple is

worth

nothing

then it is

not

necessary

for me to

pay you.”

Bill

picked out

a good

apple，began

to eat