题目

解比例．7∶28=15∶xx=________。 答案：【答案】60 【解析】根据比例的基本性质，先把比写成两个外项积等于两个内项积的形式，然后根据等式的性质求出未知数的值即可.7:28=15:x解：7x=28×15x=28×15÷7x=60故答案为：60Nancy spoke in such a low voice that _____ students in our class could hear her.             [     ]A. many B. a few C. few