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OpenStudy (anonymous):
When a number is decreased by 30%, the result is 28. What is the number?
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OpenStudy (saifoo.khan):
28 : 70 x : 100 Cross multiply.
OpenStudy (anonymous):
decreasing a number by 30% is the same as multiplying the number by .70 so write \[.7x=28\] and solve for x via \[x=28\div .7\]
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