Question 602440
A two-digit number is 4 times the sum of its digits. The tens digit is 3 less than the units digit. What is the number?
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let u=units digit
t=tens digit
..
t=u-3
10t+u=4(t+u)
10t+u=4t+4u
6t=3u
6(u-3)=3u
6u-18=3u
3u=18
u=6
t=6-3=3
number: 36