Naughty Pigs cost 25 yuan each. Garfield is cheaper than Naughty Pigs, but the price is also an integer, and he buys 2 less than Naughty Pigs. The total cost is 280 yuan. How many playful pigs did you buy?
俏皮猪25元一个，加菲猫比俏皮猪便宜，但价格也是整数元，并比俏皮猪少买2个，共花了280元．问买了多少只俏皮猪？
<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<result>7</result>