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The number increases by 15 gives 60 find the number |
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Answer» ong>Answer: Think about the definition of percent. 15% is just 15/100. If a number is DECREASED by 15%, that’s 1–15/100, which is 85/100. Therefore, x*85/100=60. To isolate the x variable, you need to MULTIPLY both sides by the reciprocal of 85/100, which is 100/85. Then you GET the equation x=60*100/85, which is the same as x=6000/85, which is approximately 70.59. You can CHECK your answer by substituting 70.59 into your original equation, which gives you 70.59–15/100*70.59=60. 15/100*70.59 is approximately equal to 10.59. Then, substituting 10.59 in for 15/100*70.59 in your original equation gives you 70.59–10.59=60, which is true. Therefore, the answer to your question is 70.59. |
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