a two digit number the units digit is 5 less than the tens digit the whole number is 8 times the sum of the digits find the number
Answers
You have a number written like AB where A is the digit in the 10s place and B is the digit in the ones place (the A and the B aren't multiplied here, they're just next to each other like the 4 and the 3 are when you write a number like 43).
The "unit's digit" is the same thing as the digit in the one's place. They say that it is 5 more than the tens digit.
B = A + 5.
They also say that AB is three times as great as the sum of its digits. AB isn't how we want to look at this number while doing this, it will be clearer what we're doing if we rewrite it as 10A + B (this comes from the fact that a number like 43 is the same thing as 4⋅10 + 3). Then
10A + B = 3(A + B)
This gives you a system of equations to solve. Reply if there are any problems with this.
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