Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.

[Q]: Problem: what is the value of n if the sum of the consecutive odd intergers y from 1 to n equals 169 ?
Options: a. 47, b. 25, c. 37, d. 33, e. 29
[A]: b


[Q]: Problem: a goods train runs at the speed of 72 kmph and crosses a 250 m long platform in 24 seconds. what is the length of the goods train ?
Options: a. 230 m, b. 240 m, c. 260 m, d. 270 m, e. none of these
[A]: a


[Q]: Problem: 130 kg of an alloy a is mixed with 160 kg of alloy b. if alloy a has lead and tin in the ratio 2: 3 and alloy b has tin and copper in the ratio 3: 4, then the amount of tin in the new alloy is ?
Options: a. 140.6 kg, b. 145.3 kg, c. 146.5 kg, d. 110.8 kg, e. 114 kg
[A]:
c