求教一道SAT的数学题：
For a dog that weighs w pounds and is x inches long to qualify for a certain competition,the difference between w and 1.5x can be no more than 5.If a dog with length 24 inches qualifies for the competition,what is one possible weight,in pounds,of this dog?
疑问：我答案求对了,但是我看SAT官方提供的参考答案是31