Lei Lei went to buy instant noodles and handed a 100-yuan note to the boss. After changing the money, the boss said to her: "You only gave me 1 note, but I gave you 16 notes, and there are 5-yuan banknotes. Instant noodles, you are really making a lot of money!", if the money the boss gives to Lei Lei is either in the face value of 10 yuan or in the face value of 5 yuan, then how many of the 16 pieces of money are in the face value of 10 yuan.
蕾蕾去买方便面，递给老板1张面值100元的纸币，老板找完钱后对她说："你才给我1张钱，我却给了你16张钱，还有价值5元的方便面，你真是太赚了啊！"，如果老板找给蕾蕾的钱要么是面值10元的，要么是面值5元的，那么这16张钱中有多少张是面值10元的．
<gadget id="calculator">16 * 5</gadget>
<output>80</output>

<gadget id="calculator">100 - 5 - 80</gadget>
<output>15</output>

<gadget id="calculator">10 - 5</gadget>
<output>5</output>

<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<result>3</result>