Question

the standard addition algorithm below is being used to add three two-digit numbers 4z + 27 + x 5 equals y 14. If x, y, and z each represent a different digit from 0 to 9 what is the value of (x)(y)(z)?

Answer 1

For the units positions of all numbers we have:

`z+7+5=4 \\ z+12=4`
From this we can conclude that total sum of these three numbers is 14. Number 1 we carry to next step. So we have:

`z+12=14 \\ z=2`

For the tens positions of all numbers we have:

`4+2+x+1=1 \\ 7+x=1`
The extra number 1 on left side comes from the carry from last step. Similar to ones position we know that total sum is 11.

`7+x=11 \\ x=4`

Now we insert x and z to find out y:

`42+27+45=y14 \\ 114=y14 \\ y=1`

Now we need to find out the product of these three numbers:

`x*y*z=4*1*2=8`