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If the temperature decreases 30 percent from m degrees to 49 degrees, then m-49=?
If the temperature decreases 30 percent from m degrees to 49 degrees, then m-49=?
admin
2021-10-21
79
问题
If the temperature decreases 30 percent from m degrees to 49 degrees, then m-49=?
选项
A、21
B、75
C、63.7
D、68
E、90
答案
A
解析
此题考查百分比上升或下降中谁是分母。温度从m度降到49度,下降了30%,那么(m-49)/m=30%。得到m=70,因此m-49=21。
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