instruction:
You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.
question:
Question: One-tenth of the students at a nursery school are 4 years old or older. If 20 students have not yet reached their third birthday, and a total of 50 students are not between 3 years old and 4 years old, how many children are in the nursery school?

 Option A: 150

 Option B: 300

 Option C: 450

 Option D: 490

 Option E: 620
answer:
Option B


question:
Question: The total of the ages of Amar, Akbar and Anthony is 30 years. What was the total of their ages three years ago ?

 Option A: 20 years

 Option B: 28 years

 Option C: 71 years

 Option D: 21 years

 Option E: 31 years
answer:
Option D


question:
Question: In a college, 280 students study Hindi, 254 students study Sanskrit and 280 students study English.
97 students study Hindi as well as physics, 138 students study Sanskrit as well as English and 152 students study Hindi as well as English.
73 students study all the three languages.
How many total number of students are there in that college?

 Option A: 350

 Option B: 500

 Option C: 650

 Option D: 235

 Option E: 450
answer:

Option B