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.
--------
Question: Problem: in what ratio must a grocer mix two varieties of pulses costing rs. 15 and rs. 20 per kg respectively so as to get a mixture worth rs. 16.50 per kg ?
Options: a. 3: 7, b. 5: 7, c. 7: 3, d. 7: 5, e. none

Answer: c


Question: Problem: the mean of 50 observations is 200. but later he found that there is decrements of 34 from each observations. what is the the updated mean is ?
Options: a. 165, b. 166, c. 190, d. 198, e. 199

Answer: b


Question: Problem: 10 men and 15 women together can complete a work in 8 days. it takes 100 days for one man alone to complete the same work. how many days will be required for one woman alone to complete the same work ?
Options: a. 127 days, b. 667 days, c. 177 days, d. 187 days, e. 600 days

Answer:
e