A shop sells two variants of chocolates - one that costs $3 and the other that costs $5. If the shop sold $131 chocolates on a given day, how many different combinations of (number of $3 sold, number of $5 sold) exist? Choose the correct choice from the following answers
A) 3	B) 5	C) 7	D) 9	E) 11
$131 = 25*$5 + 2*$3   We can find other combinations by reducing the $5 chocolates by 3 (which is -$15)and increasing the $3 chocolates by 5 (which is +$15).   The number of $5 chocolates can be 25, 22, 19, 16,...,1 for a total of 9 combinations.   The answer is 9.
<result>D</result>
A shop sells two variants of chocolates - one that costs $3 and the other that costs $5. If the shop sold $131 chocolates on a given day, how many different combinations of (number of $3 sold, number of $5 sold) exist?