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Numbers in General Form

The units dig...

Question

The units digit of a two digit number is 3 and 7 times the sum of the digits is the number itself find the number

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Solution

let u=units digit=3

let t=tens digit
10t+u=number
.. given
7(u+t)=10t+u
7u+7t=10t+u
21+7t=10t+3
3t=18
t=6
10t+u=60+3=63
number=63

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