SOLUTION: how do I solve a number is decreased by 30% and then doubled to be 91. What was the original number?
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Question 997308: how do I solve a number is decreased by 30% and then doubled to be 91. What was the original number?
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
= the original number
When it is decreased by , what is left is
of .
That is .
When is doubled, the result is
, and that equals .
The equation that state that is
.
Solving:
can be simplified to , because
<--><--> .
then,
-->-->
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