Statement (1) contains two variables and only one equation. Hence, it cannot determine the value of
l + 2t. So, Statement (1) alone is not sufficient.
Similarly, Statement (2) contains two variables and only one equation. Hence, it cannot determine the value of l + 2t. So, Statement (2) alone is not sufficient.
With Statement (1) and Statement (2) together, we have two equations in two unknowns:
l + t = 4
l + 3t = 9
This system may have a solution. To find out, add the equations:
(l + t) + (l + 3t) = 4 + 9
2l + 4t = 13
l + 2t = 13/2
Hence, the statements together answer the question. The answer is (C).