中国是桃树的故乡．如图为八月份某一桃树的枝条，A、B、C 代表三项生理活动．请你对下面几个问题作答：

居民使用英语，大多属于白色人种的发达国家是（）

解不等式：15x≥33﹣2（6x﹣24），并把它的解集在数轴上表示出来．

A Policeman and a Thief  
One day a policeman was taking a thief to the city . On the way , they saw a shop . The thief said . “ Let me go into the shop to buy some bread . We can eat it in the train . ”
The policeman agreed . The thief went into the shop and ran out of the back door . When the policeman knew that , he began to look for the thief everywhere . At last the policeman caught(抓获) thief again . They went on to the city . On the way they came to the same shop . The thief wanted to buy some bread again . “Oh , no . ” said the policeman , “You did that before , and you ran away . This time I^’ll go into the shop and buy bread . You must wait here for me . ”

在一个不透明的箱子里放有x个除颜色外其它完全相同的球，这x个球中白球只有3个，每次将球搅拌均匀后，任意摸出一个球记下颜色再放回箱子，通过大量重复摸球实验后发现，摸到白球的频率稳定在30%，那么可以推算出x最有可能是____ 个．