Takuya's parents gave him $100 dollars as a birthday gift. Since he loves board games, he spent $20 out of his present on board games at the end of each month until his money ran out.
Let f(n) be the amount of money that remained from Takuya's present during month n where n=1 represents the month he received his present.
f is a sequence. What kind of sequence is it?

Well, He spent all of his money on board games in five months. Because, total money =$100

he spent $20 out of his present on board games at the end of each month

money spent in 1 month is $20

Let's assume he takes 'x' months

so, total money spent = money spent in 1 month* total number of months, So we get 5.  Well, The best answer will be is 5. Good Luck!

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