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Let A equal the number of four digit odd numbers. Let B equal the number of four digit multiples of 5. Find \(A+B\) .

tertre  Feb 17, 2018

Best Answer 

 #1
avatar+12266 
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There are  9000 numbers between 1000 and 9999 (inclusive)

  Half of these are odd numbers    A = 4500

1000 is divisible by 5  as is 9995      1 + (9995-1000)/5 = 1800 = B

 

A+B = 4500 + 1800 =  6300

ElectricPavlov  Feb 17, 2018
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1+0 Answers

 #1
avatar+12266 
+1
Best Answer

There are  9000 numbers between 1000 and 9999 (inclusive)

  Half of these are odd numbers    A = 4500

1000 is divisible by 5  as is 9995      1 + (9995-1000)/5 = 1800 = B

 

A+B = 4500 + 1800 =  6300

ElectricPavlov  Feb 17, 2018

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