If the temperature decreases 30 percent from m degrees to 49 degrees, then m-49=?

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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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If the temperature decreases 30 percent from m degrees to 49 degrees, then m-49=?

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