Near Intersection of I-35 & I-90 Southern Mn. | NHpower - 12/10/2018 13:50
no single digit x 2 will carry a 2.
i.e. 9+9=18, carry the 1.
Agree - Carry would be 0 or 1.
Looking at the rightmost E's: H = E + E or H= 2E (No carry involved)
Looking at the leftmost E's: A= 2E but there may have been a carry in so then A = 2E + 1
Substituting H=2E into the first yields A=H which is not allowed therefore the other choice must be correct
so by substitution A= 2E +1 becomes A= H + 1.
Finally sinks in.
Edited by tedbear 12/10/2018 15:37
|