In winter, Xiao Ming and Xiao Qiang played snowballs in the snow. They built a conical snowdrift in a cylindrical basin with a depth of 18 cm, which was equal to the bottom of the basin. If the snow melts, its volume will decrease by 10%. So how many centimeters should they be piled up to ensure that there is just a basin of water after the snow melts?
在冬天里，小明和小强在雪地里玩堆雪球，他们在一个深18厘米的圆柱形盆子里堆了一个和盆子底面相等的圆锥形雪堆．如果雪融化后体积会减少10%．那么他们应堆多少厘米高，才能确保雪融化后刚好得到一盆水？
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