Given a simple high-school level math question, you are required to solve it and provide the final answer. The final answer is always a single number. These questions can range from a variety of topics like simple arithmetic, solving equations, converting a quantity from one unit to another, finding remainders/GCD/LCM, finding probabilities etc. Each question has only one correct answer. This answer can be a positive or negative integer, a fraction or a decimal number. If the answer is a negative number use the hyphen (e.g. -42) symbol for the minus sign. For decimal numbers, do not add extra zeros after the decimal point. For fractional numbers, separate the numerator and denominator using a forward slash (e.g. 3/25).

[EX Q]: Two letters picked without replacement from jbbfbbbfffo. What is prob of sequence jf?
[EX A]: 2/55

[EX Q]: What is 6*(16/20)/(6/5)?
[EX A]: 4

[EX Q]: Suppose -3*l - 3*a - 3 + 39 = 0, -10 = -2*a. Suppose l*k - 3*k = 68. What is the tens digit of k?
[EX A]:
1