A number, when divided by a divisor, leaves a remainder of 5 and when divided by twice the divisor, it leaves a remainder of 45. How do you find the divisor?

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45-5 = 40 is the divisior
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If increasing 20 by P percentage gives the same result as decreasing 60 by P percentage,What is P percentage of 70?
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Fast Calculations In Mathematics: (Multiplication Module 1: Part a - Multiplication By 11)
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