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The four-digit number “25AB” is divisible by nine, with A the tens digit and B the units digit. How many different such four-digit numbers could “25AB” represent?

 Nov 3, 2019
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The four-digit number “25AB” is divisible by nine, with A the tens digit and B the units digit. How many different such four-digit numbers could “25AB” represent?

 

Well,

The four digits must add to a number that is divisable by 9.

A+B can be no more than 18

2+5=7

A+B+7 can be no more than 25

so

A+B+7=9 or 18 

 

You can finish it. laugh

 Nov 3, 2019

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