Problem 2)
1) x=y+1
This means that x and y are consecutive positive integers adding up to 77. The only consecutive integers that can do this are 38 and 39. Sufficient.
2)X and Y have the same tens digit.
The only numbers that add up to 77 and fit this description are also 38 and 39.
Sufficient.
I think the answer's D.
1) x=y+1
This means that x and y are consecutive positive integers adding up to 77. The only consecutive integers that can do this are 38 and 39. Sufficient.
2)X and Y have the same tens digit.
The only numbers that add up to 77 and fit this description are also 38 and 39.
Sufficient.
I think the answer's D.
