Study the following information carefully and answer the questions given below: Ten lecturers P, Q, R, S, T, U, V, W, X and Y teach in the same colleg...

Study the following information carefully and answer the questions given below: Ten lecturers P, Q, R, S, T, U, V, W, X and Y teach in the same college. They give lectures in five months (April, May, June, September and December). They give lectures in each month on 7th and 21st date. Only two lectures held in a month. The lectures are attended by different number of students. The total strength of students is 100 in each class and 50% attendance is compulsory for each class. The number of students will be even in the month of 30 days and odd in the month of 31 days. Only one lecturer give lecture on one date of a month. Different number of students attends class on different days. No lecturer can give the lecture after W. U gives lecture in the month which has 30 days. T and Q give lectures after U on the 7th of different months respectively. Number of students who attend class on 7th September is a whole square (two digit number). R does not give the lecture in the month in which Y and Q gives lecture. The sum of number of students who attend class on the 7th of two month is 152. Only three lecturers give lecture between U and the lecturer whose class is attended by 68 students. The difference of number of students who attend class on 7th September and the sum of number of students who attend class on May, is 58. Q gives lecture in the month which has 30 days. The average of number of students who attend class on 21st April and 21st June is 76.P gives lecture in the month which has 31 days. T gives lecture in one of the day before Q. Total 55 students attend V’s lecture. V does not give lecture in the month in which W gives. There are four persons who give lectures between V and S. Y gives lecture in the month which is after the month in which V gives lecture. The total number of students who attend class in five months is 714.The sum of number of students who attend class on 7th may and 7th June is 147. Students who attend class on 7th June is less than 90. The difference of the number of students who attend class of lecturer Y and R is 4.X gives lecture after P and the number of students who attend his lecture is greater than 70 and less than 80 and is not divisible by 4. The number of students who attend class on 7th December is multiple of 11. The number of students who attend the lecture of W is greater than 60 but less than 70.
Which among the following is the number of students who attend class on 7th December?