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How many minutes is it before 12at noon if 90 minutes ago it was four times as m
How many minutes is it before 12at noon if 90 minutes ago it was four times as m
游客
2024-08-18
33
管理
问题
How many minutes is it before 12at noon if 90 minutes ago it was four times as many minutes past 9 a. m. ?
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答案
72
解析
(设是中午12点以前x分钟。根据题意可得此方程式:x=4[12×60一(90+x)一9×60]解得X=72)
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